Fix phone propTypes (#33)

Now that the `phone` prop can support the string "text" to open up in messages instead of attempt to phone the number the propType needs to change to support both booleans and string.

Author: Joseph Smith

src/index.js

@@ -299,7 +299,10 @@ Autolink.propTypes = {
   numberOfLines: PropTypes.number,
   onPress: PropTypes.func,
   onLongPress: PropTypes.func,
-  phone: PropTypes.bool,
+  phone: PropTypes.oneOfType([
+    PropTypes.bool,
+    PropTypes.string,
+  ]),
   renderLink: PropTypes.func,
   showAlert: PropTypes.bool,
   stripPrefix: PropTypes.bool,