Fix * Allow single string value for loading packs ([`6820c64`](https://github.com/mcbeet/beet/commit/6820c64c29d1ebd8a37d1da84c13eb767a3aab43))
0.50.5
Fix * Merge files from auto_yaml ([`766ab0e`](https://github.com/mcbeet/beet/commit/766ab0e3022e43cf3e06866e6f153e5e4f3357bc))
0.50.4
Fix * Don't include empty pre_load, load and post_load tags by default ([`38a3d31`](https://github.com/mcbeet/beet/commit/38a3d316ec7000833e337eb5a9d394af4d1667f8))
0.50.3
Fix * Allow specifying tree root using keyword argument ([`11c0abf`](https://github.com/mcbeet/beet/commit/11c0abf5c787d914fcf2804eab058f22d886df1e))