3.0.30

Bug fixes:

• write all 'about' metadata fields out, not just select few #2488
• fix lists getting nested during merging of configs, leading to TypeErrors #2494
• make always_include_files act on host_prefix, not build_prefix #2497
• warn users when script_env passes env vars through #2502
• fix build string pyXY being just pyX when input didn't have full python version #2504

Contributors:

• @jakirkham
• @msarahan