Bump version to 5.0.0-beta003

Author: matthid

RELEASE_NOTES.md

@@ -1,3 +1,6 @@
+#### 5.0.0-beta003 - 26.09.2017
+* ENHANCEMENT: Fix some migration warnings, Docs and bugs - https://github.com/fsharp/FAKE/pull/1686
+
 #### 5.0.0-beta002 - 25.09.2017
 * BREAKING-CHANGE: Rework Fake.Core.Target package - https://github.com/fsharp/FAKE/pull/1664
 * ENHANCEMENT: Update fake 5 to netcoreapp20 - https://github.com/fsharp/FAKE/pull/1678