Update requirements-dev.txt

Generated with pipenv:

    $ pipenv lock -r -d > requirements-dev.txt

requirements-dev.txt

@@ -1,16 +1,21 @@
 -i https://pypi.org/simple
+appdirs==1.4.3
 attrs==19.3.0
 backcall==0.1.0
+black==19.10b0
+click==7.0
 decorator==4.4.1
 entrypoints==0.3
 flake8==3.7.9
 ipython-genutils==0.2.0
 ipython==7.9.0
+isort==4.3.21
 jedi==0.15.1
 mccabe==0.6.1
 more-itertools==7.2.0
 packaging==19.2
 parso==0.5.1
+pathspec==0.6.0
 pexpect==4.7.0 ; sys_platform != 'win32'
 pickleshare==0.7.5
 pluggy==0.13.1
@@ -22,6 +27,9 @@ pyflakes==2.1.1
 pygments==2.5.1
 pyparsing==2.4.5
 pytest==5.3.1
+regex==2019.11.1
 six==1.13.0
+toml==0.10.0
 traitlets==4.3.3
+typed-ast==1.4.0
 wcwidth==0.1.7