doc - Update changelog
src - Bump version to 0.3
Prevent the vuln_heartbleed scan from attempting to call len on payload when it is None.

Signed-off-by: David Black <dblack@atlassian.com>
Merge pull request #6 from dbaxa/fix_vuln_heartbleed_scan

src/scan - Prevent the vuln_heartbleed scan from attempting to call len on payload when it is None.
src/report - Fix error if cert chain not in kb
src - Bump version to 0.3.1
doc - Update Changelog