3.0.1: Update CHANGELOG.md

##[3.0.1] - 2020-07-09
##Stable Release
###Fix

• Hashbang has to be #!/usr/bin/env php, not #!/usr/bin/php (@MoogyG)

3.0.0-beta9: Update CHANGELOG.md

##[3.0.0-beta9] - 2020-05-29
###Fix

• Remove empty Expect HTTP header in Client
• Fix "400 Bad request" on Document.create #22 (Thanks @fdglefevre)

2.0.0-beta2

QA

2.0.0-alpha4

Update CHANGELOG.md