New conversion to square km for area is incorrect

[otherjason]

In the previous release, the area was specified in square meters. In 1.0.2, that was intended to be changed to square kilometers; this conversion is done here. However, this isn't correct; to convert square meters to square kilometers, you need to divide by 1 million (1000 * 1000), not by 1000.

[andrewharvey]

Thanks for flagging this @otherjason. I'm still very new to publishing modules to npm, versioning and releasing and I've made a few failures here.

To fix this I'll

• [x] add a changelog so people can see what changes have been made version to version

• [x] use semver so you know which changes are breaking

• [x] tag releases in github

• [x] revert back to sq m to avoid the breaking change

• [ ] rethink the units. The reason I did /1000 is I was finding the numbers to be too large and trying to count 0's was a pain. But you're right my basic math failed here. Notation like 1.234e-5 would be helpful, I might add another option which just has the base 10 exponent number, and keep _area in sq meters.

[andrewharvey]

Closing as I've reverted back to sq meters in v1.0.3.