Bump version to 0.5.0alpha.
Bump version to 0.5.0alpha.

nevans/typhoeus,EddyLuten/typhoeus,sportngin/typhoeus,t3hpr1m3/typhoeus,AvnerCohen/typhoeus,tinfoil/typhoeus,pravi/typhoeus,nju520/typhoeus,kkirsche/typhoeus,tompscanlan/typhoeus,telekomatrix/typhoeus,typhoeus/typhoeus,bitgal/typhoeus,PericlesTheo/typhoeus,wcmonty/typhoeus