Bump source installs to use git 2.16

doc/install/installation.md

@@ -93,9 +93,9 @@ Is the system packaged Git too old? Remove it and compile from source.
     # Download and compile from source
     cd /tmp
-    curl --remote-name --progress https://www.kernel.org/pub/software/scm/git/git-2.14.3.tar.gz
-    echo '023ffff6d3ba8a1bea779dfecc0ed0bb4ad68ab8601d14435dd8c08416f78d7f  git-2.14.3.tar.gz' | shasum -a256 -c - && tar -xzf git-2.14.3.tar.gz
-    cd git-2.14.3/
+    curl --remote-name --progress https://www.kernel.org/pub/software/scm/git/git-2.16.2.tar.gz
+    echo '9acc4339b7a2ab484eea69d705923271682b7058015219cf5a7e6ed8dee5b5fb  git-2.16.2.tar.gz' | shasum -a256 -c - && tar -xzf git-2.16.2.tar.gz
+    cd git-2.16.2/
     ./configure
     make prefix=/usr/local all