Remove a broken link in Readme.md (#332)

* Remove a broken link in Readme.md

The link for open file limit was dead. The solution is elaborated in a short, compact way.

* Reformat code

* Fix formatting

* Move noqa note to propagate

* Fix formatting in streams.py

Co-authored-by: William Barnhart <williambbarnhart@gmail.com>

README.md

@@ -407,8 +407,15 @@ introduced in Python 3.6 (`async`, `await`, variable type annotations).
 
 ### I get a maximum number of open files exceeded error by RocksDB when running a Faust app locally. How can I fix this
 
-You may need to increase the limit for the maximum number of open files. The
-following post explains how to do so on OS X: https://blog.dekstroza.io/ulimit-shenanigans-on-osx-el-capitan/
+You may need to increase the limit for the maximum number of open files. 
+On macOS and Linux you can use: 
+
+```ulimit -n max_open_files``` to increase the open files limit to max_open_files.
+
+On docker, you can use the --ulimit flag:
+
+```docker run --ulimit nofile=50000:100000 <image-tag>``` 
+where 50000 is the soft limit, and 100000 is the hard limit [See the difference](https://unix.stackexchange.com/a/29579).
 
 ### What kafka versions faust supports
 

faust/streams.py

@@ -394,8 +394,8 @@ async def add_to_buffer(value: T) -> T:
     async def take_with_timestamp(
         self, max_: int, within: Seconds, timestamp_field_name: str
     ) -> AsyncIterable[Sequence[T_co]]:
-        """Buffer n values at a time and yield a list of buffered values with the timestamp
-           when the message was added to kafka.
+        """Buffer n values at a time and yield a list of buffered values with the
+           timestamp when the message was added to kafka.
 
         Arguments:
             max_: Max number of messages to receive. When more than this