pure_extensions 3.1.0

It adds utility extensions to the dart classes and adds some utility classes, builders.

[3.1.0]

• Update dependencies
• Added RationalSerializer for decimal, int, double

[3.0.0]

• Migrate to null-safety
• added withoutNull in nullable iterable

[2.1.2]

• Added asStream and asBroadcast
• Added onTrackedErrorResume and onTrackedErrorReturnWith

[2.1.1]

• Added CustomUriBuilder for parsing uri in built value
• Added on Iterable methods: toMap, tryElementAt
• Added List.removeAll
• Removed ReadableFile in favour of XFile in cross_file package

[2.1.0]

• Added on String methods: toNum, toInt, toDouble, toUri with try and without
• Added Uri extensions and UriBuilder
• Added DateTime extensions and DateTimeBuilder
• Removed tinyColor dependency and extension
• Removed all dart:ui import

[2.0.3]

• Added more extension for Duration (human extensions, copyWith, built)
• Added DurationBuilder for build Duration

[2.0.2]

• Export GeoPoint

[2.0.1]

• Added ByPassSerializer and LocaleSerializer

[2.0.0]

• Separate the dart language extensions from the flutter_extensions package