v1.1.0

Commits

• 28e123a: README fixes (Lex Bailey)
• 21480d2: WIP made a start on averages and outward-only codes (Lex Bailey)
• 59ee47b: can now read outward-only postcodes (Lex Bailey)
• 6e4e48e: add some more tests and fix a few more issues (Lex Bailey)
• 9d8771e: run tests before release (Lex Bailey)
• 47c3c9c: oops! fix rust code (Lex Bailey)
• 5624423: fix some tests, get coverage up (Lex Bailey)
• 75e3138: update readme docs (Lex Bailey)
• 5e16103: add version history notes (Lex Bailey)