Update CHANGELOG.md to present tense.
Update CHANGELOG.md to present tense.

Signed-off-by: Steven Shropshire <e0eaefab33cb0c3d300c8879d154a2846a56c9dd@getbraintree.com>

braintree/android-card-form,braintree/android-card-form,braintree/android-card-form