GH Actions updates, remove CircleCI (#84)

Remove CirclCI. Update GH Actions step to generate coverage stats, bump setup-go job to v3, limit GH actions run to push on main + pr.

Author: wdbetts

.circleci/config.yml

@@ -1,6 +1,8 @@
 name: golines test
 on:
   push:
+    branches:    
+      - main
   pull_request:
 
 jobs:
@@ -18,7 +20,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: test golines
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v3        
         with:
           go-version: ${{ matrix.go }}
-      - run: go test .
+          cache: true
+      - run: make test