Install v23 on Travis

Author: carlosmn

script/install-libgit2.sh

@@ -13,9 +13,9 @@ if [ "x$TRAVIS_BRANCH" = "xnext" ]; then
 fi
 
 cd "${HOME}"
-wget -O libgit2-0.22.3.tar.gz https://github.com/libgit2/libgit2/archive/v0.22.1.tar.gz
-tar -xzvf libgit2-0.22.3.tar.gz
-cd libgit2-0.22.1 && mkdir build && cd build
+wget -O libgit2-0.23.1.tar.gz https://github.com/libgit2/libgit2/archive/v0.23.1.tar.gz
+tar -xzvf libgit2-0.23.1.tar.gz
+cd libgit2-0.23.1 && mkdir build && cd build
 cmake -DTHREADSAFE=ON -DBUILD_CLAR=OFF -DCMAKE_BUILD_TYPE="RelWithDebInfo" .. && make && sudo make install
 sudo ldconfig
 cd "${TRAVIS_BUILD_DIR}"