updating Gotenberh version

Author: Julien Neuhart

README.md

@@ -44,7 +44,7 @@ services:
   # your others services
 
   gotenberg:
-    image: thecodingmachine/gotenberg:1.0.0
+    image: thecodingmachine/gotenberg:2.0.0
 ```
 
 You may now start your stack using:
@@ -112,4 +112,4 @@ Voilà! :smiley:
 
 ---
 
-Would you like to update this documentation ? Feel free to open an [issue](../../issues).
+Would you like to update this documentation ? Feel free to open an [issue](../../issues).