Deprecate kits

[awhitford]

• Deprecates legacy AnimatedTextKit classes. Resolves Deprecate legacy Kit classes #211
• Updated example project
• Updated README examples

[codecov]

Codecov Report

Merging #216 (a30c65a) into master (1748cac) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #216   +/-   ##
=======================================
  Coverage   95.09%   95.09%           
=======================================
  Files           9        9           
  Lines         428      428           
=======================================
  Hits          407      407           
  Misses         21       21           

Impacted Files	Coverage Δ
lib/src/colorize.dart	95.00% <ø> (ø)
lib/src/fade.dart	100.00% <ø> (ø)
lib/src/rotate.dart	100.00% <ø> (ø)
lib/src/scale.dart	100.00% <ø> (ø)
lib/src/typer.dart	100.00% <ø> (ø)
lib/src/typewriter.dart	100.00% <ø> (ø)
lib/src/wavy.dart	100.00% <ø> (ø)

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[aagarwal1012]

Everything looks fine to me. Great work! 💯

[SirusCodes]

@awhitford ig example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata is a file which should be in .gitignore

And can we add MIGRATION.md file as well and all the deprecation warning should have this link?

[awhitford]

example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata is a file which should be in .gitignore

@SirusCodes As you know, the project uses the GitIgnore Template for Flutter. I don't see this as part of the exclusion.

And can we add MIGRATION.md file as well and all the deprecation warning should have this link?

Please note that I did document some migration advice in the README.
Can you show me an example of a project that has their deprecation warnings link to the MIGRATION page?
(I'm concerned that I don't like the idea of hard-coding URLs in a Deprecation message, especially when projects can get forked.)

[awhitford]

I felt an urgency to merge it since I don't want new animations to feel the need to add Kit classes. Issues like #215 can further improve usability.