Improve script for Ubuntu

Author: rtfpessoa

scripts/update-bower-version.sh

@@ -9,8 +9,17 @@ set -e
 
 echo "diff2html updating bower version..."
 
-RELEASE_VERSION=$(cat package.json | grep "version" | head -1 | gsed -e 's/  "version": "\(.*\)",/\1/')
+if [[ "$OSTYPE" == "linux-gnu" ]]; then
+  SED_BIN=sed
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+  SED_BIN=gsed
+else
+  echo "Cannot run this script in ${OSTYPE}"
+  exit 1
+fi
 
-gsed -i 's/.*"version".*/  "version": "'${RELEASE_VERSION}'",/' bower.json
+RELEASE_VERSION=$(cat package.json | grep "version" | head -1 | $SED_BIN -e 's/  "version": "\(.*\)",/\1/')
+
+$SED_BIN -i 's/.*"version".*/  "version": "'${RELEASE_VERSION}'",/' bower.json
 
 echo "diff2html updated bower version successfully!"