Release v0.3.7

What's Changed

• rename gilbrat -> gibrat for scipy fix by @zdelrosario in #224
• update scipy ver requirement for gibrat fix by @zdelrosario in #225
• Dev uqtheme by @zdelrosario in #227
• Fix nls fixedvals by @zdelrosario in #228
• add random seed argument by @zdelrosario in #229
• Dev trunc by @zdelrosario in #230
• Dev piston model by @zdelrosario in #231
• Dev mom bounded by @zdelrosario in #232

Full Changelog: v0.3.6...v0.3.7