Add tests for go 1.6&1.7 (#56)

* Add tests for go 1.6&1.7

* Dont install dep

* Update README

* Remove go tip from tests

.travis.yml

@@ -1,8 +1,9 @@
 language: go
 go:
+  - 1.6
+  - 1.7
   - 1.8
   - 1.9
-  - tip
 
 env:
   global:

README.md

@@ -74,7 +74,7 @@ To update Objx to the latest version, run:
     go get -u github.com/stretchr/objx
 
 ### Supported go versions
-We support the lastest two major Go versions, which are 1.8 and 1.9 at the moment.
+We support the lastest four major Go versions, which are 1.6, 1.7, 1.8 and 1.9 at the moment.
 
 ## Contributing
 Please feel free to submit issues, fork the repository and send pull requests!

Taskfile.yml

@@ -5,7 +5,6 @@ dl-deps:
   desc: Downloads cli dependencies
   cmds:
     - go get -u github.com/golang/lint/golint
-    - go get -u github.com/golang/dep/cmd/dep
 
 update-deps:
   desc: Updates dependencies