adds fetchUserChannels, updates fetchReactionsForCast types parameter, and depreciates limit notes for fetchTrendingChannels

[MrKevinOConnell]

New Method

User

fetchUserChannels -> https://docs.neynar.com/reference/user-channels

Updates Existing Methods

Reaction

fetchReactionsForCast -> https://docs.neynar.com/reference/reactions-cast

• types is now an array of ReactionsType, we join the array into a string at the end.

misc

Feed

fetchTrendingChannels -> https://docs.neynar.com/reference/trending-channels fixed limit

[manan19]

lgtm