Add update script

Closes #6

update-plugins.sh

@@ -0,0 +1,24 @@
+#! /bin/bash
+
+echo "Update vim-plug"
+vim +PlugUpgrade +qall
+vim +PlugClean! +qall
+
+# Install all bundles
+echo "Install all bundles"
+if hash nvim 2>/dev/null; then
+    if hash pip 2>/dev/null; then
+        echo 'Installing neovim python module in $HOME'
+        pip install --user neovim
+    fi
+    echo "If using Neovim, install the python modules in your environment"
+    nvim +PlugUpdate +PlugInstall +qall
+fi
+vim +PlugUpdate +PlugInstall +qall
+
+vim --version | grep -q '\+lua' || { echo "Warning: Default vim does not include lua"; }
+vim --version | grep -q '\+ruby' || { echo "Warning: Default vim does not include ruby."; }
+vim --version | grep -q '\+python' || { echo "Warning: Default vim does not include python"; }
+
+echo "All done!"
+exit 0