.drone.yml: Correct npm task

.drone.yml

@@ -0,0 +1,34 @@
+kind: pipeline
+type: docker
+name: node10
+
+steps:
+- name: build
+  image: node:10-alpine
+  commands:
+  - npm install
+  - npm run build
+
+---
+kind: pipeline
+type: docker
+name: node12
+
+steps:
+- name: build
+  image: node:12-alpine
+  commands:
+  - npm install
+  - npm run build
+
+---
+kind: pipeline
+type: docker
+name: node14
+
+steps:
+- name: build
+  image: node:14-alpine
+  commands:
+  - npm install
+  - npm run build

.travis.yml

@@ -2,7 +2,6 @@ language: node_js
 node_js:
   - 10
   - 12
-  - 13
   - 14
 script: npm run build
 os: linux