chore: Update lcov to latest available version

Author: franky47

.travis.yml

@@ -49,7 +49,7 @@ install:
             # Install newer lcov (1.9 seems to fail: http://gronlier.fr/blog/2015/01/adding-code-coverage-to-your-c-project/)
             export LCOV_ROOT="$HOME/lcov"
             mkdir -p "$LCOV_ROOT"
-            wget http://ftp.de.debian.org/debian/pool/main/l/lcov/lcov_1.12.orig.tar.gz --output-document="$LCOV_ROOT/lcov.tar.gz"
+            wget http://ftp.de.debian.org/debian/pool/main/l/lcov/lcov_1.14.orig.tar.gz --output-document="$LCOV_ROOT/lcov.tar.gz"
             tar xf "$LCOV_ROOT/lcov.tar.gz" --strip-components=1 -C $LCOV_ROOT
             export PATH="$LCOV_ROOT/bin:$PATH"
             which lcov