* remove reference to `find_near_matches_ngrams()` which no longer exists (see issue #5)
* add some explanation about combining different search criteria
The badge hosting at 'pypip.in' has been broken for a while
now, it was supposed to be fixed in the following PR(s):
- badges/pypipins#39
- badges/pypipins#38
- badges/pypipins#37
That does not appear to have actually happened and/or is not
getting addressed, so switch to a more reliable badge hosting
site that provides the same badge information.