removed pointycastle

Author: RomitRadical

pubspec.lock

@@ -184,7 +184,7 @@ packages:
     source: hosted
     version: "1.11.0"
   pointycastle:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: pointycastle
       url: "https://pub.dartlang.org"

pubspec.yaml

@@ -15,7 +15,6 @@ dependencies:
     git:
       url: https://github.com/zapit-io/bip39.git
       ref: master
-  pointycastle: ^3.6.0
   bip32:
     git:
       url: https://github.com/zapit-io/bip32-dart.git