Update release workflow and prepare 0.4.5

Update README for version 0.4.4

Bump to 0.4.3

Bump to 0.4.2

Bump to 0.4.1

Correct copying into gh-pages directory

Correct copying into gh-pages directory

This minor release adds the new `TusClient#beginOrResumeUploadFromURL…

…` method which

allows you to begin an upload from a given upload URL without using the Creation
extension to create an upload first. This is necessary when you are interacting
with upload server which do not support the Creation extension, such as the Vimeo API.
Please see the documentation for more details.

Upgrade dependencies and update used JDKs (tus#16)

* Remove unsupported JDK versions

* Update Gradle to version 4.4

* Disable ECDSA algorithm

* Run before install

* Fix deprication error for left shift operator

The error in question was:
> The Task.leftShift(Closure) method has been deprecated and is scheduled to be
> removed in Gradle 5.0. Please use Task.doLast(Action) instead.

* Remove Java 6 tests but compile with support for Java 6

Gradle has problem downloading dependencies:
https://travis-ci.org/tus/tus-java-client/jobs/318341024#L505

* Update mockserver-netty

* Use sudo for changing Java security file

* Add comment

Deployment support for jdk 6 (tus#12)