2019-12-19-01

d2278f5 Bump @types/leaflet from 1.5.6 to 1.5.7 in /assets (#374)
c7bb85d Bump css-loader from 3.3.2 to 3.4.0 in /assets (#373)
c5f819c Bump mini-css-extract-plugin from 0.8.0 to 0.8.2 in /assets (#372)
8cfc328 Improve development instructions in README (#371)
97f11b3 Bump webpack from 4.41.2 to 4.41.3 in /assets (#370)
3ba89b9 Bump css-loader from 3.3.0 to 3.3.2 in /assets (#369)
a08f02b Add shuttle button and shape for the Mattapan line (#368)