Update README, bumpr, and package.json

bumpr does not properly support package.json files, creating a
non-semver compliant version. Updated the README to list compability
with Flask applications post 0.5.0 release. Bumped package.json manually
for release.

README.rst

@@ -40,6 +40,31 @@ Compatibility
 
 Flask-RESTX requires Python 2.7 or 3.4+.
 
+On Flask Compatibility
+======================
+
+Flask and Werkzeug moved to versions 2.0 in March 2020. This caused a breaking change in Flask-RESTX.
+
+.. list-table:: RESTX and Flask / Werkzeug Compatibility
+    :widths: 25 25 25
+    :header-rows: 1
+
+
+    * - Flask-RESTX version
+      - Flask version
+      - Note
+    * - <= 0.3.0
+      - < 2.0.0
+      - unpinned in Flask-RESTX. Pin your projects!
+    * - == 0.4.0
+      - < 2.0.0
+      - pinned in Flask-RESTX.
+    * - >= 0.5.0
+      - All (For Now)
+      - unpinned, import statements wrapped for compatibility
+    * - trunk branch in Github
+      - All (and updated more often)
+      - unpinned, will address issues faster than releases.
 
 Installation
 ============

bumpr.rc

@@ -9,7 +9,6 @@ clean =
     inv clean
 files =
     README.rst
-    package.json
 
 [bump]
 unsuffix = true

package.json

@@ -1,6 +1,6 @@
 {
   "name": "flask-restx",
-  "version": "0.4.1-dev",
+  "version": "0.5.0",
   "description": "Fully featured framework for fast, easy and documented API development with Flask",
   "repository": "python-restx/flask-restx",
   "keywords": [