v0.4.0

What's Changed

• publish needs build by @matth-love in #50
• coastlines and tide stations by @matth-love in #51
• overhaul; inland-decay is optional, extrapolate is the default; use t… by @matth-love in #52
• max disconuity from .5 -> 5 by @matth-love in #53
• Discontinuity removed by @matth-love in #54
• blend tidal/geoid by @matth-love in #55
• MDT and decay by @matth-love in #56
• carve vdatum pixels out of the land_mask by @matth-love in #57

Full Changelog: v0.3.7...v0.4.0