Merge branch 'trunk' into feature/#38-Getting-warnings-on-VM-startup-after-running-a-dart-pub-upgrade

# Conflicts:
#	pubspec.yaml

Author: konstantinullrich

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 2.2.0
+- Update `asn1lib` dependency to ^1.5.0 and fix the resulting lint warnings 
+
 ## 2.1.0
 - Add `KeypairFactory`, `RSAKeypairFactory` and `ECKeypairFactory`
 - Update dependencies

pubspec.yaml

@@ -6,7 +6,7 @@ repository: https://github.com/konstantinullrich/crypton
 issue_tracker: https://github.com/konstantinullrich/crypton/issues
 
 environment:
-  sdk: ^3.0.0
+  sdk: '>=2.14.0 <4.0.0'
 
 dependencies:
   pointycastle: ^3.7.3