v0.5.2

What's Changed

• Lower zvalue from bad traces to 0 by @mscheltienne in #171
• Prevent annotations from extending beyond (0, raw.times[-1]) and fix edition of annotation descriptions by @mscheltienne in #172
• Remove shortcut "h" plotting epoch PTP amp when viewing raw by @mscheltienne in #174
• Disable time format if we don't have a measurement date by @mscheltienne in #175
• Fix removal of DC on precomputed data when nan's are present in the array by @mscheltienne in #176
• Improve deletion of annotation by @mscheltienne in #173
• MAINT: Patch old MNE ver test by @larsoner in #177

Full Changelog: v0.5.1...v0.5.2