Merge pull request #198 from CrowCpp/drone_coveralls

Fix coveralls branch

Author: mrozigor

.drone.yml

@@ -15,7 +15,7 @@ steps:
 
   commands:
   - export DEBIAN_FRONTEND=noninteractive
-  - export TRAVIS_BRANCH=$DRONE_SOURCE_BRANCH
+  - export TRAVIS_BRANCH=$DRONE_BRANCH
   - export TRAVIS_JOB_ID=$DRONE_BUILD_NUMBER
   - apt-get -y update
   - apt-get -y install libboost-all-dev doxygen mkdocs graphviz zlib1g-dev gcc clang make cmake python3 python3-pip git