Remove unncessary dependencies in travis config

The github pip libraries are not necessary when just running the sqf validator

.travis.yml

@@ -4,10 +4,5 @@ branches:
 language: python
 python:
 - '3.4'
-before_script:
-- if [ -n "${GH_TOKEN}" ] && [ "${TRAVIS_BRANCH}" == "master" ] && [ "${TRAVIS_PULL_REQUEST}" == "false" ]; then
-    pip install pygithub;
-    pip install pygithub3;
-  fi
 script:
-- python3 tools/sqf_validator.py
+- python3 tools/sqf_validator.py