update changelog for release 4.1.21

CHANGELOG.md

@@ -1,5 +1,19 @@
 To generate the log, run `git log --pretty='* %h - %s (%an, %ad)'  TAGNAME..HEAD` replacing TAGNAME and HEAD as appropriate.
 
+# 4.1.21 - Bugfix Release
+
+* 6fb78d046 - chore: upgrade classgraph to 4.8.105 (Ronald Holshausen, Sun May 23 15:31:07 2021 +1000)
+* 49d975b2d - fix: Fallbck to env vars for pact.provider.version property #1365 (Ronald Holshausen, Sun May 23 13:38:27 2021 +1000)
+* a5c455275 - fix: Format the error correctly when publishing results fail [Gradle/Maven] #1364 (Ronald Holshausen, Sun May 23 11:52:11 2021 +1000)
+* f92fcb66e - fix: HAL client must return an error if the post request fails #1364 (Ronald Holshausen, Sun May 23 10:58:43 2021 +1000)
+* 0fd9c6b1f - fix: codenarc violations (Ronald Holshausen, Sun May 23 10:05:39 2021 +1000)
+* b54305351 - fix: fail the verification if publishing verification results fails [Maven/Gradle] #1364 (Ronald Holshausen, Sat May 22 17:51:34 2021 +1000)
+* ea9c49de7 - fix: fail the test if publishing verification results fails [JUNIT5] #1364 (Ronald Holshausen, Sat May 22 17:19:18 2021 +1000)
+* 76f91643f - fix: fail the test if publishing verification results fails #1364 (Ronald Holshausen, Sat May 22 17:04:26 2021 +1000)
+* 80fc25367 - chore: upgrade Spock to 2.0 (Ronald Holshausen, Sat May 22 12:32:24 2021 +1000)
+* e3f52dc53 - fix: backported fix from v4.2.x #1345 (Ronald Holshausen, Wed Apr 21 16:19:39 2021 +1000)
+* b5fee030a - bump version to 4.1.21 (Ronald Holshausen, Sun Apr 11 15:49:59 2021 +1000)
+
 # 4.1.20 - Bugfix Release
 
 * 30083b062 - fix(regression): IO Exceptions are now wrapped #1337 (Ronald Holshausen, Sun Apr 11 11:10:03 2021 +1000)