Add bottomsheet screenshot

README.md

@@ -126,6 +126,8 @@ The `bottomsheets` module contains extensions to turn modal dialogs into bottom
 other functionality like showing a grid of items. Be sure to checkout the sample project for this,
 too!
 
+<img src="https://raw.githubusercontent.com/afollestad/material-dialogs/master/art/bottomsheet_customview.png" width="200px" />
+
 ```gradle
 dependencies {
   ...

sample/src/main/res/values/colors.xml

@@ -7,9 +7,9 @@
   <color name="primaryDark">#5002c7</color>
   <color name="accent">#9c47ff</color>
 
-  <color name="primary_custom">#26c6da</color>
-  <color name="primaryDark_custom">#0095a8</color>
-  <color name="accent_custom">#6ff9ff</color>
-  <color name="primary_custom_translucent">#4026c6da</color>
+  <color name="primary_custom">#607D8B</color>
+  <color name="primaryDark_custom">#546E7A</color>
+  <color name="accent_custom">#388E3C</color>
+  <color name="primary_custom_translucent">#40388E3C</color>
 
 </resources>