feat: Fill to brim

[Kalaiz]

• Allows users to let the view fill to the brim on their discretion via the newly created boolean attribute: fill_to_brim.

Users alter this feature like this:

. . .
wave:wave_length="middle"
wave:fill_to_brim="true" />

• Includes only Gradle update and README Badge fix done in #25. Note: It does not consider the feature implemented in #25.

• README sample code update based on this feature.