removed Pkg.checkout(GeometryTypes from .travis.yml because this caused problem

Author: simonschoelly

.travis.yml

@@ -19,6 +19,6 @@ notifications:
 # uncomment the following lines to override the default test script
 script:
   - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi
-  - julia -e 'using Pkg; Pkg.clone(pwd()); Pkg.build("NetworkLayout"); Pkg.checkout("GeometryTypes"); Pkg.clone("LightGraphs"); Pkg.test("NetworkLayout"; coverage=true)'
+  - julia -e 'using Pkg; Pkg.clone(pwd()); Pkg.build("NetworkLayout"); Pkg.clone("LightGraphs"); Pkg.test("NetworkLayout"; coverage=true)'
 after_success:
   - julia -e 'using Pkg; cd(Pkg.dir("NetworkLayout")); Pkg.add("Coverage"); using Coverage; Coveralls.submit(process_folder()); Codecov.submit(process_folder())'