Updated travis ci

Author: YamiOdymel

.travis.yml

@@ -1,19 +1,15 @@
 language: go
 
 go:
-  - "1.7"
-  - "1.8"
-  - "1.9"
-  - "1.10"
-  - "1.11"
-  - "1.12"
-  - "1.13"
-  - master
+    - "1.13"
+    - "1.14"
+    - "1.15"
+    - master
 
 script:
-  - go get golang.org/x/tools/cmd/cover
-  - go get github.com/mattn/goveralls
-  - go get ./...
-  - go test ./...
-  - go test -v -covermode=count -coverprofile=coverage.out
-  - $GOPATH/bin/goveralls -coverprofile=coverage.out -service=travis-ci -repotoken $COVERALLS_TOKEN
+    - go get golang.org/x/tools/cmd/cover
+    - go get github.com/mattn/goveralls
+    - go get ./...
+    - go test ./...
+    - go test -v -covermode=count -coverprofile=coverage.out
+    - $GOPATH/bin/goveralls -coverprofile=coverage.out -service=travis-ci -repotoken $COVERALLS_TOKEN