~gbmor/rustwtxt

cut some unnecessary code
added docs.rs badge
changed doc comments around
updated integ test
documentation added for new methods
changed structs api
testing for panic in Twtxt::new()
Tweet/Twtxt structs tested
impl blocks for Twtxt/Tweet
structs for twtxt.txt/statuses
returning Option<T> for several funcs
parse nick from mention
using http_req instead of reqwest
brought the dependency list from 186 to 37
debugged tag parsing
parsing tags out of twtxt.txt
disabled test causing segfault in tarpaulin
ignoring local coverage reports
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