Release -v2.1.1 for JitPack delivery

In this PR, I've worked on these:

• Fixed release build issue -v2.1
• Added buildSrc support
• Updated proguard rules
• Updated gradle versioning

What's Changed

• Bugs Fixes 2.1 by @AliAzaz in #13

Full Changelog: 2.1.0...2.1.1

Release -v2.1.0 for JitPack delivery

What's Changed

• Range validation showing error in float type by @AliAzaz in #7
• Implemented builder pattern modification by @AliAzaz in #8
• Updated example with readme by @AliAzaz in #10
• Gradle update, Bugs Fixes, & Functionality changes by @AliAzaz in #12

New Contributors

• @AliAzaz made their first contribution in #7

Special Thanks

Thanks to people who have raised bugs #2 and #9.

Full Changelog: 2.0.0...Release-v2.1.0

Fourth ReleaseX

Convert library to Kotlin and add AndroidX support

Third Release

Clearing error sign if edittext is not on focus.
Thanks @Udayraj123 for pointed out an issue

Second Release

Fixed bug of clearing focus.
Thanks Udayraj123 for pointed out an issue

First (Final)-Post Release

structure some code and update readme

First (Final) Release

After tested this library in lot of devices. I finally released my First--Final release

Third (Testing) Release

It's testing release in which I fixed some bugs

Second (Testing) Release

Testing release to test this library on different devices or different API levels and also add one more functionality i.e Pattern checking

Initial Release

Testing library from different perspectives