Hugo 0.38.1: Some Live Reload Fixes

This is a bug-fix that is mainly motivated by some issues with server live reloading introduced in Hugo 0.38.

• Fix livereload for the home page bundle f87239e4 @bep #4576
• Fix empty BuildDate in “hugo version” 294c0f80 @anthonyfok
• Fix some livereload content regressions a4deaeff @bep #4566
• Update github.com/bep/gitmap to fix snap build 4d115c56 @anthonyfok #4538
• Fix two tests that are broken on Windows 26f34fd5 @neurocline

This release also contains some improvements:

• Add bash completion 874159b5 @anthonyfok
• Handle mass content etc. edits in server mode 730b66b6 @bep #4563