Resolve "RustyWot : get_paths is stuck in an infinite loop !"

Closes #39 (closed)

wotb/Cargo.toml

 [package]
 name = "duniter-wotb"
-version = "0.7.0"
+version = "0.7.1"
 authors = ["nanocryk <nanocryk@duniter.org>", "elois <elois@duniter.org>"]
 description = "Makes Web of Trust computations for the Duniter project."
 repository = "https://git.duniter.org/nodes/rust/duniter-rs"