test: add circle CI jobs for Go 1.11 and 1.13 (#178)

Author: QuentinBrosse

.circleci/config.yml

@@ -3,6 +3,15 @@
 # Check https://circleci.com/docs/2.0/language-go/ for more details
 version: 2
 jobs:
+  test-go-1-13:
+    docker:
+      - image: circleci/golang:1.13
+    steps:
+      - checkout
+      - run: go mod download
+      - run:
+          name: Run unit tests
+          command: go test -v ./...
   test-go-1-12:
     docker:
       - image: circleci/golang:1.12
@@ -12,6 +21,15 @@ jobs:
       - run:
           name: Run unit tests
           command: go test -v ./...
+  test-go-1-11:
+    docker:
+      - image: circleci/golang:1.11
+    steps:
+      - checkout
+      - run: go mod download
+      - run:
+          name: Run unit tests
+          command: go test -v ./...
   test-go-1-10:
     docker:
       - image: circleci/golang:1.10
@@ -26,5 +44,7 @@ workflows:
   version: 2
   test:
     jobs:
+      - test-go-1-13
       - test-go-1-12
+      - test-go-1-11
       - test-go-1-10