Update ci.yml (#41)

Author: lostella

.github/workflows/ci.yml

@@ -1,18 +1,19 @@
 name: CI
 on:
-  - push
-  - pull_request
-  - workflow_dispatch
+  push:
+    branches: ['master']
+  pull_request:
+  workflow_dispatch:
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }}
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         version:
-          - '1.4'
+          - '1'
           - '1.6'
-          - 'nightly'
         os:
           - ubuntu-latest
           - macOS-latest
@@ -37,7 +38,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
         with:
-          version: '1.6'
+          version: '1'
       - run: |
           julia --project=docs -e '
             using Pkg