Added workaround for duplicate branches. Closes #7

README.md

@@ -78,7 +78,6 @@ pip install -r requirements-prod.txt
    python /path/to/find_forks --user=user --repo=repo
    ```
 
-
 2. Use as module:
 
    ```python
@@ -87,6 +86,17 @@ pip install -r requirements-prod.txt
    find_forks()
    ```
 
+### How to remove duplicate branches
+
+Current workaround to remove duplicates:
+
+```ShellSession
+for BRANCH in $( git branch -r --no-color | cut -d" " -f3 ); do
+    git checkout "$BRANCH"
+    git branch -r --merged --no-color | grep -v -e "\(origin\|upstream\|your\-github\-name\)/" | xargs -n 1 git branch -r -d
+done
+```
+
 ### How to fetch large repo
 
 When repo has over 6000 forks one may face a github's API limit. To continue fetching use `start-page` option: