feat(CLI): did you mean for struct values

* functionality is cursor-aware, and fixes the actual string the user
  passed in. That way, it is made very clear how the suggested value
  is to be used.
* it's a known weakness of the implementation that it operates on a
  flattened list of field names, and thus may make nonsensical
  suggestions.
* added punctuation to all errors

Fixes #67
[skip ci]

etc/api/type-cli.yaml

@@ -27,6 +27,7 @@ cargo:
   is_executable: YES
   dependencies:
     - clap = "*"
+    - strsim = "*"
     - yup-hyper-mock = "*"
     - serde = ">= 0.3.0"
     - serde_macros = "*"