Update dependency flutter_webrtc to ^0.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_webrtc	dependencies	minor	^0.2.8 -> ^0.3.0

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Release Notes

cloudwebrtc/flutter-webrtc

v0.3.3

Compare Source

[0.3.3] - 2020.09.14

• Add RTCDTMFSender for mobile, web and macOS.
• Improve RenegotiationNeededCallback.
• Refactor RTCVideoView for web and solve the resize problem.
• Reduce code size.

v0.3.2

Compare Source

[0.3.2] - 2020.09.11

• Reorganize the directory structure.
• Replace class name navigator to MediaDevices.
• Downgrade pedantic version to 1.9.0.

v0.3.1

Compare Source

[0.3.1] - 2020.09.11

• [Dart] Apply pedantic linter and more rigorous analysis options.

v0.3.0+1

Compare Source

[0.3.0+1] - 2020.09.06

• [Dart] FIX - missing null check onIceGatheringState (web)

v0.3.0

Compare Source

[0.3.0] - 2020.09.05

• [Dart] Improve RTCVideoView.
• [Android] Refactors Android plugin alongside the embedding V2 migration.
• [Dart] Fix .ownerTag not defined for web.
• [Dart] Added label as read-only property.
• [macOS] Updated WebRTC framework to work with AppStoreConnect.
• [Dart] Make 'constraints' argument optional.
• [Dart] Make createOffer constraints optional.
• [iOS/Android/Web] Adding createLocalMediaStream method to PeerConnectionFactory.
• [Web] Fixing multiple video renderers on the same HTML page for Flutter Web.
• [iOS] Add peerConnectionId to data channel EventChannel.
• [Android] Add library module ProGuard configuration file.
• [iOS] Fix typo in render size change check condition
• [README] Add missed Android usage hint.

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