Add scrip/get-version script

Previous way wasn't working and this way we edit one less file when
pushing new versions.

Makefile

@@ -33,7 +33,7 @@ LICENSE_PATH="$(shell pwd)/LICENSE"
 
 OUTPUT_PACKAGE=SwiftLint.pkg
 
-VERSION_STRING=0.41.0
+VERSION_STRING="$(shell ./script/get-version)"
 
 .PHONY: all clean build install package test uninstall docs
 
@@ -153,7 +153,6 @@ endif
 	$(eval NEW_VERSION := $(shell echo $(NEW_VERSION_AND_NAME) | sed 's/:.*//' ))
 	@sed -i '' 's/## Master/## $(NEW_VERSION_AND_NAME)/g' CHANGELOG.md
 	@sed 's/__VERSION__/$(NEW_VERSION)/g' script/Version.swift.template > Source/SwiftLintFramework/Models/Version.swift
-	@sed -i  '' 's/VERSION_STRING.*/VERSION_STRING=$(NEW_VERSION)/g' Makefile
 	git commit -a -m "release $(NEW_VERSION)"
 	git tag -a $(NEW_VERSION) -m "$(NEW_VERSION_AND_NAME)"
 	git push origin master

script/get-version

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -euo pipefail
+
+cat Source/SwiftLintFramework/Models/Version.swift | awk -F '"' '{print $2}' | xargs