Merge pull request mqttjs#1307 from mqttjs/security-update

fix: security vulnerability in ws stream

Merge pull request mqttjs#1293 from mqttjs/release_6_21_2021_2

release: 4.2.8

Merge pull request mqttjs#1291 from mqttjs/release_6_21_2021

release: 4.2.7

Merge pull request mqttjs#1218 from YoDaMa/release_11_24_2020

release(4.2.6): bump package version

release(4.2.5): bump package.json (mqttjs#1212)

release(4.2.4): bump package version (mqttjs#1195)

release(4.2.3): secure connection bugfix (mqttjs#1191)

* release(4.2.3): secure connection bugfix

* fix package.json

release(4.2.2): bump package version (mqttjs#1187)

release(4.2.1): bump package version (mqttjs#1149)

release(4.2.0): bump package version