switch ci to g1.14

Author: umputun

.github/workflows/ci.yml

@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: set up go 1.13
+      - name: set up go 1.14
         uses: actions/setup-go@v1
         with:
-          go-version: 1.13
+          go-version: 1.14
         id: go
 
       - name: checkout