Update Readme.md

Adding known usage in popular app.

Update build.gradle

Fixed Bug: SlidingUpPanelLayout ignores setPanelState()

In SlidingUpPanelLayout.dispatchTouchEvent(), ignore horizontal scrolls

This will allow child views with horizontally scrollable content to behave as expected, regardless of the state of the panel.

I have updated the 26.+ to the correct version. And yes the Gradle version also has to be upgraded in the file AndroidSlidingUpPanel/build.gradle
Line no 8 to -> classpath 'com.android.tools.build:gradle:2.3.2'
and
Line no 26 to -> gradleVersion = '3.3'

Fix potential NPEs and synchronization errors.

Changed mPanelSlideListeners to a CopyOnWriteArrayList. Addresses #695.

Fixed Bug: SlidingUpPanelLayout ignores setPanelState(), as long as animated settling is in progress.

Fix NPE in drawChild() when returning to Fragment with animation. App…

Bugfix: java.util.ConcurrentModificationException on mPanelSlideListeners

Fixed a drag issue. (same as #526 but ready to merge)

Save wrong state while dragging or in drag motion

Fix #623, a crash on Android N

Refactors the way savedinstancestate works to avoid BadParceableExcep…

Update deps