Add isEmpty, remove now drops unused nodes

2.1.0

2.1.0 add isEmpty, remove drops unused nodes

Update to Elm 0.19

2.0.3

chore(release): v2.0.3 Upgrade to Elm 0.19

Update to Elm 0.18

Moved to elm-test as well.

Update to Elm 0.17.

fix(dependency): update elm-lang/core to 4.0.1 minimum as it fixes a …

…bug that test hit

Hid Trie constructors, Added Encoder and Decoder.

feat(Overhaul): add Trie.Json.Encoder and Trie.Json.Decoder, changed …

…API to hide Trie constructors

feat(Overhaul): changes to Trie model were mode to make Encoder and Decoder simpler and the
resultant encoded model  smaller.

Initial release.

1.0.0

Created Trie package from another project.