Update the automate support matrix (#345)

There have been several fixes for both Inspec and the Audit cookbook to
support reporting to Automate v2.  This updates the support matrix to
indicate the minimum versions required to work with the latest Automate.

Specifically #334 and inspec/inspec#3401

Signed-off-by: Will Fisher <wfisher@chef.io>

README.md

@@ -21,6 +21,7 @@ The `audit` cookbook supports a number of different reporters and fetchers which
 |--------------------|------------------|--------------------------|
 |   < 0.8.0          |   ≤ 1.23.0       |   ≤ 3.1.0                |
 |   ≥ 0.8.0          |   ≥ 1.24.0       |   ≥ 4.0.0                |
+|   ≥ 2              |   ≥ 2.2.102      |   ≥ 7.1.0                |
 
 #### Chef Compliance