docs: Remove depencies section from README (#68)

README.md

@@ -46,10 +46,3 @@ svgcheck [options] SOURCE
 | `-o FILENAME` | `--out=FILENAME` | specify an output filename, default to stdout                                     |
 | `-g`          | `--grey-scale`   | use a grey scale heuristic to determine what is white                             |
 |               | `--grey-level`   | cut off level between black and white                                             |
-
-## Dependencies
-
-`svgcheck` depends on the following packages:
-
-- [lxml](http://lxml.de) *(>= 4.1.1)*
-- [xml2rfc](https://github.com/ietf-tools/xml2rfc/) *(>= 3.16.0)*