Add script to update Xcode and Pod version

.rocket.yml

@@ -0,0 +1,4 @@
+---
+before:
+  - script:
+      content: ./scripts/update-version.sh "$VERSION"

scripts/update-version.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+if [ $# -ne 1 ]; then
+    echo "A single argument specifying the version must be provided"
+    exit 1
+fi
+
+VERSION=$1
+NORMALISED_VERSION=${VERSION#"v"}
+
+echo "Setting version in Xcode project to $NORMALISED_VERSION"
+sed -E -i "" "s/(VERSION_NUMBER[[:blank:]]*=[[:blank:]]*).*;/\1$NORMALISED_VERSION;/" ./Partial.xcodeproj/project.pbxproj
+echo "Setting version in Podspec to $NORMALISED_VERSION"
+sed -E -i "" "s/(spec\\.version[[:blank:]]*=[[:blank:]]*)\".*\"/\1\"$NORMALISED_VERSION\"/" ./Partial.podspec