Fix Unhandled Exception when AnimationController.reverse

[fachrifaul]

Description

Fix Unhandled Exception: 'package:flutter/src/animation/animation_controller.dart': Failed assertion: line 487 pos 7: '_ticker != null': AnimationController.reverse() called after AnimationController.dispose()

Type of Change

• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 Code refactor
• [ ] ✅ Build configuration change
• [ ] 📝 Documentation
• [ ] 🗑️ Chore

[codecov-commenter]

Codecov Report

Merging #13 (5dd85b6) into master (4bef6ad) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #13   +/-   ##
=======================================
  Coverage   95.34%   95.34%           
=======================================
  Files          37       37           
  Lines        1461     1462    +1     
=======================================
+ Hits         1393     1394    +1     
  Misses         68       68           

Impacted Files	Coverage Δ
lib/src/view/widgets/notification.dart	82.53% <100.00%> (+0.28%)	:arrow_up:

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[syedmurtaza108]

@fachrifaul Thank you for your contribution😍. As a sign of appreciation, I would add you in ReadMe.md file of next release.