add go.mod

.circleci/config.yml

@@ -2,14 +2,23 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/golang:1.10
+      - image: circleci/golang:1.11
 
     working_directory: /go/src/github.com/jesseduffield/lazygit
     steps:
       - checkout
-      - restore_cache:
-          keys:
-            - pkg-cache-{{ checksum "Gopkg.lock" }}-v1
+      - run:
+          name: Ensure go.mod file is up to date
+          command: |
+            export GO111MODULE=on
+            mv go.mod /tmp/
+            go mod init
+            export GO111MODULE=auto
+
+            if [ $(diff /tmp/go.mod go.mod|wc -l) -gt 0 ]; then
+              diff /tmp/go.mod go.mod
+              exit 1;
+            fi
       - run:
           name: Run gofmt -s
           command: |
@@ -17,6 +26,9 @@ jobs:
              find . ! -path "./vendor/*" -name "*.go" -exec gofmt -s -d {} \;
              exit 1;
             fi
+      - restore_cache:
+          keys:
+            - pkg-cache-{{ checksum "Gopkg.lock" }}-v2
       - run:
           name: Run tests
           command: |
@@ -31,7 +43,7 @@ jobs:
           command: |
             bash <(curl -s https://codecov.io/bash)
       - save_cache:
-          key: pkg-cache-{{ checksum "Gopkg.lock" }}-v1
+          key: pkg-cache-{{ checksum "Gopkg.lock" }}-v2
           paths:
             - ~/.cache/go-build