ci/travis/before_install.sh: use mainstream coveralls

ci/travis/after_success.sh

@@ -6,5 +6,7 @@ if [ "$BUILD_NAME" != "PHP_7.2_WITH_ASAN" ]; then
     echo "$TRAVIS_SECURE_ENV_VARS"
     echo "$TRAVIS_BRANCH"
     sh -c 'if test "$TRAVIS_SECURE_ENV_VARS" = "true" -a "$TRAVIS_BRANCH" = "master"; then echo "run coverage"; ./run_code_coverage_upload.sh; fi'
+    ln -s ../../../mapparser.y build/CMakeFiles/mapserver.dir/
+    ln -s ../../../maplexer.l build/CMakeFiles/mapserver.dir/
     coveralls --exclude renderers --exclude mapscript --exclude apache --exclude build/mapscript/mapscriptJAVA_wrap.c --exclude build/mapscript/mapscriptPYTHON_wrap.c --exclude shp2img.c --exclude legend.c --exclude scalebar.c --exclude msencrypt.c --exclude sortshp.c --exclude shptreevis.c --exclude shptree.c --exclude testexpr.c --exclude sym2img.c --exclude testcopy.c --exclude shptreetst.c --exclude tile4ms.c --extension .c --extension .cpp
 fi

ci/travis/before_install.sh

@@ -12,7 +12,7 @@ sudo apt-get install --allow-unauthenticated protobuf-c-compiler libprotobuf-c0-
 sudo apt-get install --allow-unauthenticated libmono-system-drawing4.0-cil mono-mcs
 sudo apt-get install --allow-unauthenticated php5-dev || sudo apt-get install --allow-unauthenticated php7-dev
 sudo apt-get install --allow-unauthenticated libperl-dev
-sudo pip install git+git://github.com/tbonfort/cpp-coveralls.git@extensions
+sudo pip install cpp-coveralls
 # install swig 3.0.12 (defaults to 2.0.11 on trusty)
 wget http://prdownloads.sourceforge.net/swig/swig-3.0.12.tar.gz
 export CC="ccache gcc"