Update badges

1. Shields finally fixed their weirdness :)
https://github.com/badges/shields/issues/8671

2. Bountysource doesn't seem to be very useful

.github/workflows/build.yml

@@ -1,4 +1,3 @@
-# the name is used by the shields.io at top of readme
 name: build
 on:
   - push

README.md

@@ -1,9 +1,8 @@
 # [![ZNC](https://wiki.znc.in/resources/assets/wiki.png)](https://znc.in) - An advanced IRC bouncer
 
-[![GitHub Workflow Status](https://img.shields.io/github/workflow/status/znc/znc/build?label=linux)](https://github.com/znc/znc/actions/workflows/build.yml)
+[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/znc/znc/build.yml?branch=master&label=linux)](https://github.com/znc/znc/actions/workflows/build.yml)
 [![Jenkins Build Status](https://img.shields.io/jenkins/s/https/jenkins.znc.in/job/znc/job/znc/job/master.svg?label=freebsd)](https://jenkins.znc.in/job/znc/job/znc/job/master/)
 [![AppVeyor Build status](https://img.shields.io/appveyor/ci/DarthGandalf/znc/master.svg?label=windows)](https://ci.appveyor.com/project/DarthGandalf/znc/branch/master)
-[![Bountysource](https://www.bountysource.com/badge/tracker?tracker_id=1759)](https://www.bountysource.com/trackers/1759-znc?utm_source=1759&utm_medium=shield&utm_campaign=TRACKER_BADGE)
 [![Coverage Status](https://img.shields.io/codecov/c/github/znc/znc.svg)](https://codecov.io/gh/znc/znc)
 [![Coverity Scan Build Status](https://img.shields.io/coverity/scan/6778.svg)](https://scan.coverity.com/projects/znc-coverity)