added settings for coveralls.io in .travis.yml

Author: alex-alrux

.travis.yml

@@ -1,5 +1,5 @@
 language: go
-
+sudo: false
 go:
   - 1.8
   - 1.7.5
@@ -33,7 +33,10 @@ go:
   - 1.1.2
   - 1.1.1
   - 1.1
-
+before_install:
+  - go get github.com/mattn/goveralls
+script:
+  - $HOME/gopath/bin/goveralls -service=travis-ci
 matrix:
   fast_finish: true
   allow_failures:

calmly_test.go

@@ -131,7 +131,8 @@ func TestStack(t *testing.T) {
 	}
 	divByZero := func() {
 		a, b := 1, 0
-		_ = a / b
+		a = a / b
+		_ = a
 	}
 
 	out := Try(divByZero)