add debugging section to README
Merge pull request #63 from alphagov/debugging-readme

[#69911946] add debugging section to README
Correct CHANGELOG release date for version 3.2.0

This release happened in April rather than May according to the Git
commit (and we're still in April at the time of writing).
[#69915642] Bump vCloud Core version to 0.0.12

Bump vCloud Core to version 0.0.12, which fixes an issue where tasks
that would show a progress bar fall over which this error message:

```
undefined method `<' for nil:NilClass
```
Merge pull request #64 from alphagov/bump-core-version

[#69915642] Bump vCloud Core version to 0.0.12
Add notes on API version

And how to pin to it/change it.
wrap readme for easy reading

(no other changes)
Amending api token section of README

The section of the README that covered using the VCloud API token
was not complete. I've added additional details that should make it
easier to use.
change fog link to correct markdown
Reword session token introductory paragraph

Based on alphagov/vcloud-tools#187 and done in consultation with
@danielabel