Updating podspec version 0.4

Author: swhitty

SwiftDraw.podspec.json

@@ -1,6 +1,6 @@
 {
   "name": "SwiftDraw",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "summary": "A Swift library that adds support for SVG files to UIImage and NSImage.",
   "homepage": "https://github.com/swhitty/SwiftDraw",
   "authors": "Simon Whitty",
@@ -10,7 +10,7 @@
   },
   "source": {
     "git": "https://github.com/swhitty/SwiftDraw.git",
-    "tag": "0.3.1"
+    "tag": "0.4.0"
   },
   "platforms": {
     "ios": "10.0",