Improving health after first pub.dev publication
After first publication on [pub.dev](https://pub.dev/packages/twilio_unofficial_programmable_video) some health suggestions were indicated.
# What could be improved
- Fix lib/src/twilio_exception.dart. (-22.95 points)
```
Analysis of lib/src/twilio_exception.dart reported 52 hints, including:
line 5 col 20: Name non-constant identifiers using lowerCamelCase.
line 6 col 20: Name non-constant identifiers using lowerCamelCase.
line 7 col 20: Name non-constant identifiers using lowerCamelCase.
line 8 col 20: Name non-constant identifiers using lowerCamelCase.
line 9 col 20: Name non-constant identifiers using lowerCamelCase.
```
- Fix lib/src/local_video_track.dart. (-0.50 points)
```
Analysis of lib/src/local_video_track.dart reported 1 hint:
line 64 col 107: Avoid using braces in interpolation when not needed.
```
- Fix lib/src/programmable_video.dart. (-0.50 points)
```
Analysis of lib/src/programmable_video.dart reported 1 hint:
line 13 col 29: Cancel instances of dart.async.StreamSubscription.
```
- Fix additional 12 files with analysis or formatting issues. (-0.50 points)
```
Additional issues in the following files:
lib/src/remote_video_track.dart (1 hint)
lib/src/camera_capturer.dart (Run flutter format to format lib/src/camera_capturer.dart.)
lib/src/connect_options.dart (Run flutter format to format lib/src/connect_options.dart.)
lib/src/local_audio_track.dart (Run flutter format to format lib/src/local_audio_track.dart.)
lib/src/local_audio_track_publication.dart (Run flutter format to format lib/src/local_audio_track_publication.dart.)
lib/src/local_participant.dart (Run flutter format to format lib/src/local_participant.dart.)
lib/src/local_video_track_publication.dart (Run flutter format to format lib/src/local_video_track_publication.dart.)
lib/src/remote_audio_track.dart (Run flutter format to format lib/src/remote_audio_track.dart.)
lib/src/remote_audio_track_publication.dart (Run flutter format to format lib/src/remote_audio_track_publication.dart.)
lib/src/remote_participant.dart (Run flutter format to format lib/src/remote_participant.dart.)
lib/src/remote_video_track_publication.dart (Run flutter format to format lib/src/remote_video_track_publication.dart.)
lib/src/room.dart (Run flutter format to format lib/src/room.dart.)
```
# Why should this be improved
To get a higher rating on pub.dev
# Any risks?
No
# More information
https://pub.dev/packages/twilio_unofficial_programmable_video#-analysis-tab-
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issue