Update CONTRIBUTING.md (#57)

Signed-off-by: CodeMaster7000 <95772109+CodeMaster7000@users.noreply.github.com>

Signed-off-by: CodeMaster7000 <95772109+CodeMaster7000@users.noreply.github.com>

Author: CodeMaster7000

CONTRIBUTING.md

@@ -15,7 +15,7 @@ We love your input! We want to make contributing to this project as easy and tra
 ### Making a PR
 
 > - Make sure you have been assigned the issue to which you are making a PR.
-> - If you make PR before being assigned, It may be labeled `invalid` and closed without merging.
+> - If you make PR before being assigned, It may be labelled `invalid` and closed without merging.
 
 - Fork the repo and clone it on your machine.
 - Add a upstream link to main branch in your cloned repo
@@ -27,7 +27,7 @@ We love your input! We want to make contributing to this project as easy and tra
 - Keep your cloned repo upto date by pulling from upstream (this will also avoid any merge conflicts while committing new changes)
 
     ```sh
-    git pull upstream master
+    git pull upstream dev
     ```
 
 - Create your feature branch