build: rm node v12/v14 (#81)

as it brings npm < 7, which does not support workspaces.:z

Author: aladdin-add

.github/workflows/ci.yml

@@ -14,8 +14,6 @@ jobs:
         node-version:
           - '17'
           - '16'
-          - '14'
-          - '12'
         os:
           - ubuntu-latest
     steps:
@@ -41,6 +39,8 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v2
+      with:
+          node-version: '16'
     - run: npm install
     - run: npm install --save-dev eslint@6
     - run: npm test
@@ -50,6 +50,8 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v2
+      with:
+          node-version: '16'
     - run: npm install
     - run: npm install --save-dev eslint@7
     - run: npm test