Downgraded back to GCC5

Author: arnavb

.travis.yml

@@ -11,10 +11,10 @@ addons:
  sources:
  - ubuntu-toolchain-r-test
  packages:
- - g++-7
+ - g++-5
 
 script:
- - g++-7 --version && g++-7 -v # Check if proper version of g++ (>=7.2) is installed
+ - g++-5 --version && g++-5 -v # Check if proper version of g++ (>=5) is installed
  - python --version # Check if the proper version of python (>=3.6) is installed
  - cd tests # Enter test directory
- - python test_all_solutions.py $TRAVIS_BUILD_DIR g++-7 # Run all tests
+ - python test_all_solutions.py $TRAVIS_BUILD_DIR g++-5 # Run all tests