Update README

  - Add new method descriptions
  - Add contributors to credit section

Author: chrismayer

README.md

@@ -9,13 +9,25 @@ Use the what3words API in your Java applications.
   double[] wordsToPosition(String[] words)
   ```
 
-  Converts a 3 words 'address' into a position
+  Converts a 3 words 'address' into a position (assumes words in the default language 'en')
+  
+  ```java
+  double[] wordsToPosition(String[] words, String language)
+  ```
+
+  Converts a 3 words 'address' (in the given language) into a position
 
   ```java
   String[] positionToWords(double[] coords)
   ```
 
-  Converts a position into a 3 words 'address'
+  Converts a position into a 3 words 'address' (language 'en')
+  
+  ```java
+  String[] positionToWords(double[] coords, String language)
+  ```
+
+  Converts a position into a 3 words 'address' (in the given language)
 
 ## Code Samples
 
@@ -37,8 +49,7 @@ What3Words w3w = new What3Words(apiKey);
 Double[] coords = {49.422636, 8.320833};
 try {
     // optionally set a different language
-    w3w.setLanguage("de");
-    String[] words = w3w.positionToWords(coords);
+    String[] words = w3w.positionToWords(coords, "de");
     System.out.println(words[0] +  "." + words[1] +  "." + words[2]);
 } catch (Exception e) {
     // do your error handling
@@ -66,6 +77,11 @@ Any contribution is warmly welcome:
 Thanks to [what3words ](http://what3words.com/) for offering such a great
 project and for any help we received by their team.
 
+Also a big thank you to all who contributed to this project:
+  * [@chrismayer](https://github.com/chrismayer)
+  * [@tsamaya](https://github.com/tsamaya)
+  * [@jstastny](https://github.com/jstastny)
+
 
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