diff --git a/poetry.lock b/poetry.lock
index de30871..433c300 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -212,6 +212,7 @@ optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.dependencies]
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
 pycodestyle = ">=2.6.0a1,<2.7.0"
 pyflakes = ">=2.2.0,<2.3.0"
@@ -224,6 +225,22 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
+[[package]]
+name = "importlib-metadata"
+version = "3.7.2"
+description = "Read metadata from Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+
 [[package]]
 name = "iniconfig"
 version = "1.1.1"
@@ -449,12 +466,15 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
+[package.dependencies]
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+
 [package.extras]
 dev = ["pre-commit", "tox"]
 
 [[package]]
 name = "prompt-toolkit"
-version = "3.0.16"
+version = "3.0.17"
 description = "Library for building powerful interactive command lines in Python"
 category = "dev"
 optional = false
@@ -539,6 +559,7 @@ python-versions = ">=3.6"
 atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
 attrs = ">=19.2.0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<1.0.0a1"
@@ -770,10 +791,22 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
+[[package]]
+name = "zipp"
+version = "3.4.1"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+
 [metadata]
 lock-version = "1.1"
-python-versions = "^3.8"
-content-hash = "6a9ee0f26b50f361d7e0e6a2275f0e3174dee1c89fbd460583c4ea3d873857b8"
+python-versions = "^3.7.1"
+content-hash = "e60e882e091af667b968c00521fd378e1220c1836d394d90bbc783920e38bb62"
 
 [metadata.files]
 agate = [
@@ -853,6 +886,10 @@ idna = [
     {file = "idna-2.10-py2.py3-none-any.whl", hash = "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"},
     {file = "idna-2.10.tar.gz", hash = "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6"},
 ]
+importlib-metadata = [
+    {file = "importlib_metadata-3.7.2-py3-none-any.whl", hash = "sha256:407d13f55dc6f2a844e62325d18ad7019a436c4bfcaee34cda35f2be6e7c3e34"},
+    {file = "importlib_metadata-3.7.2.tar.gz", hash = "sha256:18d5ff601069f98d5d605b6a4b50c18a34811d655c55548adc833e687289acde"},
+]
 iniconfig = [
     {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
     {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
@@ -969,8 +1006,8 @@ pluggy = [
     {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
 ]
 prompt-toolkit = [
-    {file = "prompt_toolkit-3.0.16-py3-none-any.whl", hash = "sha256:62c811e46bd09130fb11ab759012a4ae385ce4fb2073442d1898867a824183bd"},
-    {file = "prompt_toolkit-3.0.16.tar.gz", hash = "sha256:0fa02fa80363844a4ab4b8d6891f62dd0645ba672723130423ca4037b80c1974"},
+    {file = "prompt_toolkit-3.0.17-py3-none-any.whl", hash = "sha256:4cea7d09e46723885cb8bc54678175453e5071e9449821dce6f017b1d1fbfc1a"},
+    {file = "prompt_toolkit-3.0.17.tar.gz", hash = "sha256:9397a7162cf45449147ad6042fa37983a081b8a73363a5253dd4072666333137"},
 ]
 ptyprocess = [
     {file = "ptyprocess-0.7.0-py2.py3-none-any.whl", hash = "sha256:4b41f3967fce3af57cc7e94b888626c18bf37a083e3651ca8feeb66d492fef35"},
@@ -1191,3 +1228,7 @@ xlrd = [
     {file = "xlrd-1.2.0-py2.py3-none-any.whl", hash = "sha256:e551fb498759fa3a5384a94ccd4c3c02eb7c00ea424426e212ac0c57be9dfbde"},
     {file = "xlrd-1.2.0.tar.gz", hash = "sha256:546eb36cee8db40c3eaa46c351e67ffee6eeb5fa2650b71bc4c758a29a1b29b2"},
 ]
+zipp = [
+    {file = "zipp-3.4.1-py3-none-any.whl", hash = "sha256:51cb66cc54621609dd593d1787f286ee42a5c0adbb4b29abea5a63edc3e03098"},
+    {file = "zipp-3.4.1.tar.gz", hash = "sha256:3607921face881ba3e026887d8150cca609d517579abe052ac81fc5aeffdbd76"},
+]