Support go 1.15 (#251)

* Support go 1.15

Signed-off-by: Julien Pivotto <[email protected]>

Author: Julien Pivotto

.circleci/config.yml

@@ -63,5 +63,8 @@ workflows:
     - test:
         name: go-1-14
         go_version: "1.14"
+    - test:
+        name: go-1-15
+        go_version: "1.15"
         # Style is only checked against the latest supported Go version.
         run_style: true

.travis.yml

@@ -6,8 +6,10 @@ go:
   - 1.11.x
   - 1.12.x
   - 1.13.x
+  - 1.14.x
+  - 1.15.x
 
 script:
   - make test
   # style is only checked against the latest supported Go version.
-  - if [[ $TRAVIS_GO_VERSION =~ ^1\.(13)\. ]]; then make style; fi
+  - if [[ $TRAVIS_GO_VERSION =~ ^1\.(15)\. ]]; then make style; fi