Packaging error in 1.1.0 prevents source distribution from being used

[jamadden]

When installing on Python 3.15, the source distribution must be used. But some versions of pip complain and fall back to 1.0.5:

Discarding https://files.pythonhosted.org/packages/2a/27/.../py_radix-1.1.0.tar.gz (from https://pypi.org/simple/py-radix/): 
Requested py-radix from https://files.pythonhosted.org/packages/2a/27/.../py_radix-1.1.0.tar.gz 
(from <internal project>) has inconsistent version: expected '1.1.0', but metadata has '1.1.0+dev.v1.1.0'
  Downloading py_radix-1.0.5.tar.gz (26 kB)

[jamadden]

Setting the VERSION environment variable to v1.1.0 lets pip install it.