Update README.md

Author: bergel

README.md

@@ -2,10 +2,10 @@
 Spy2 is a profiling framework for Pharo. Spy2 source code is kept on Monticello. You can install it using the following incantation.
 
 ```Smalltalk
-Gofer it
-    smalltalkhubUser: 'Pharo' project: 'MetaRepoForPharo60';
-    configurationOf: 'Spy2';
-    loadStable.
+Metacello new 
+  baseline: 'Spy2'; 
+  repository: 'github://ObjectProfile/Spy2/src'; 
+  load
 ```  
 
 Spy2 is also available on the Pharo Catalog Browser.
@@ -16,11 +16,4 @@ More information can be found on *http://bergel.eu/download/papers/Berg12c-Hapao
 
 
 # Contributing to Spy and Hapao
-If you wish to contribute to Spy2 or Hapao (e.g., fixing bug, proposing an improvement), please, commit to http://smalltalkhub.com/#!/~ObjectProfile/Contribution
-```Smalltalk
-MCHttpRepository
-	location: 'http://smalltalkhub.com/mc/ObjectProfile/Contribution/main'
-	user: ''
-	password: ''
-```  
-    
+If you wish to contribute to Spy2 or Hapao (e.g., fixing bug, proposing an improvement), please, submit pull requests.