3.5.1

• Retreiving need toolchain components' tarballs fails
• build stopped because expat-2.2.10.tar.xz could not be downloaded.
• Some minor fixes

3.5.0

• Ubuntu 20.04 as builder
• Python 3 fixes and patches
• PIP version 3.5
• Solve bash >= 3.1 error
• Script optimisation

2.7.0

• Ubuntu 20.04 as builder
• Python 3 fixes and patches
• PIP version 2.7
• Solve bash >= 3.1 error
• script optimisation