v0.10.0

Fixed bugs:

• Fix character set detection by using node-chardet instead of jschardet – fixes #59

Misc:

• Test on Node 10, and no longer on Node 4
• Use Greenkeeper for keeping dependency versions up to date
• Add tests to ensure the character set conversion code works (with dependencies) on various test data, instead of just checking it uses stubbed dependencies
• Fix deprecation warnings on Node 10 around using the Buffer() constructor
• Update sinon to ^6.0.0
• Update nyc to ^12.0.1