chore(README): Add migration note about upgrading from < 0.30.0

Closes #1444

License: MIT
Signed-off-by: Pascal Precht <[email protected]>

Author: 0x-r4bbit

CHANGELOG.md

@@ -53,6 +53,17 @@ Signed-off-by: David Dias <[email protected]>
 License: MIT
 Signed-off-by: Alan Shaw <[email protected]>
 
+* Git pre-push hook has been removed
+
+  This can cause problems during installation of npm dependencies, in case the repository
+  is not freshly cloned. Prior to 0.30.0 a pre-push hook has been set up to verify
+  changes before sending them to a remote repository. Due to the removal, existing
+  installations will have dead symlinks that cause `npm install` to fail.
+
+  The migration path is to remove the `pre-hook` file/symlink inside `.git/hooks` of
+  your clone.
+
+  [Read here](https://github.com/ipfs/js-ipfs/blob/master/README.md#important-note) for more information.
 
 
 <a name="0.29.3"></a>

README.md

@@ -42,6 +42,13 @@ You can check the development status at the [Waffle Board](https://waffle.io/ipf
 
 [**`Weekly Core Dev Calls`**](https://github.com/ipfs/pm/issues/650)
 
+
+### Important note
+
+If you're upgrading from < 0.30.0 to >= 0.30.0 you might run into errors when installing dependencies due to non-existing git hooks [as discussed here](https://github.com/ipfs/js-ipfs/issues/1444).
+
+Please remove `.git/hooks/pre-push` first and run `npm install` again to fix this issue as mentioned in the linked discussed above.
+
 ## Tech Lead
 
 [David Dias](https://github.com/diasdavid)
@@ -360,10 +367,10 @@ The core API is grouped into several areas:
   - [`ipfs.files.addPullStream([options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filesaddpullstream)
   - [`ipfs.files.addReadableStream([options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filesaddreadablestream)
   - [`ipfs.files.cat(ipfsPath, [options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filescat). Alias to `ipfs.cat`.
-  - [`ipfs.files.catPullStream(ipfsPath, [options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filescatpullstream)  
+  - [`ipfs.files.catPullStream(ipfsPath, [options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filescatpullstream)
   - [`ipfs.files.catReadableStream(ipfsPath, [options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filescatreadablestream)
   - [`ipfs.files.get(ipfsPath, [options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filesget). Alias to `ipfs.get`.
-  - [`ipfs.files.getPullStream(ipfsPath, [options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filesgetpullstream)  
+  - [`ipfs.files.getPullStream(ipfsPath, [options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filesgetpullstream)
   - [`ipfs.files.getReadableStream(ipfsPath, [options])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#filesgetreadablestream)
   - [`ipfs.ls(ipfsPath, [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#ls)
   - [`ipfs.lsPullStream(ipfsPath)`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#lspullstream)