Fix bug with dependency bigrams (with lemmas and lowercasing enabled)#1

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prrao87 wants to merge 3 commits intokristopherkyle:masterfrom

Commits on Aug 6, 2020

Fix bug: Lowercasing w/ lemmas in dependency bigrams works now
prrao87
committed
Fix space_list and ignore_list to be consistent with original version
prrao87
committed
Forgot to include else block for -PRON- case (fixed now)
prrao87
committed