chore: Prepare for v1.13.0 (#6854)

Author: iamareebjamal

CHANGELOG.md

@@ -1,5 +1,12 @@
 ## Changelog
 
+#### v1.13.0 (2020-02-20):
+
+- Fix cron job timings preventing multiple emails to attendees
+- Change email links to be more accessible
+- Fix invoice email generation errors
+- Add proper etag support by changing to weak etags
+
 #### v1.12.0 (2020-02-02):
 
 - Add check if donation ticket has payment method enabled

app/api/server_version.py

@@ -1,6 +1,6 @@
 from flask import Blueprint, jsonify
 
-SERVER_VERSION = '1.12.0'
+SERVER_VERSION = '1.13.0'
 
 info_route = Blueprint('info', __name__)
 _build = {'version': SERVER_VERSION}