Sometimes, when rebasing interactively with git, we need to squash a sequence of commits in a branch.

For example, we need to transform this:
```
pick 0253dc894f bumped
pick 5a1e86933c remove dependency
pick bffoffb395 memberships rpc resource
pick 222fabf5e0 rpc membership service
pick 726a2f9a10 remove crypto logic
```

To this: 
```    
squash 0253dc894f bumped
squash 5a1e86933c remove dependency
squash bffoffb395 memberships rpc resource
squash 222fabf5e0 rpc membership service
pick 726a2f9a10 remove crypto logic
```

Doing that manually one by one can be a bit tiresome, so if you're using Vim you can use visual blocks:
1. Place the cursor at the beginning of the line with the first commit you want to squash
2. Enter visual block mode (CTRL-V)
3. Select all the rows you want to squash
4. Hit 'c' and type 'squash' to replace the 'pick' command
5. Press ESC to apply that change to all the selected rows