Vermin

* **Reached 1000 rules in total!**
* 128 new rules:
* 4 modules
* 85 classes/functions/constants
* 34 kwargs
* 2 array typecodes
* 3 codecs error handler names
* 20 codecs encodings
* New detections:
* array typecodes, like `'Q'` in `array.array('Q', [1, 2, 3])`
* codecs error handler names, like `'namereplace'` in:
py
from codecs import encode
encode('å', 'ascii', 'namereplace') b'\\N{LATIN SMALL LETTER A WITH RING ABOVE}'

The arguments of following functions/classes are inspected: `codecs.encode`, `codecs.decode`, `codecs.open`, `codecs.EncodedFile`, `codecs.iterencode`, `codecs.iterdecode`, `codecs.IncrementalEncoder`, `codecs.IncrementalDecoder`, `codecs.StreamWriter`, `codecs.StreamReader`, `codecs.StreamReaderWriter`, `codecs.StreamRecorder`
* codecs encodings, like `'koi8_t'` in:
py
import codecs
codecs.getdecoder(encoding='koi8_t')

The arguments of the following functions/classes are inspected: `codecs.encode`, `codecs.decode`, `codecs.lookup`, `codecs.getencoder`, `codecs.getdecoder`, `codecs.getincrementalencoder`, `codecs.getincrementaldecoder`, `codecs.getreader`, `codecs.getwriter`, `codecs.open`, `codecs.EncodedFile`, `codecs.iterencode`, `codecs.iterdecode`

* 59 new rules:
* 3 modules
* 55 classes/functions/constants
* 1 kwargs
* Detection of coroutines (`async` and `await`)
* Upgraded urllib3 to version 1.24.2 due to [security vulnerability](https://nvd.nist.gov/vuln/detail/CVE-2019-11324)
* PyPi: Changed development status from beta to production/stable

Due to a security vulnerability in PyYAML <=3.13, it has been updated to 4.2b1.

Vermin now also takes .pyw files into account, thanks to gousaiyang 👍

Due to a security vulnerability in `urllib3` <1.23, it has been updated to 1.24.1.

Due to a security vulnerability in `requests` <=2.19.1, it has been updated to 2.20.0.