Fix filtering on accTransactions.

[td202]

Purpose

Addresses #121

This corrects the filtering that was intended to exclude the ValidatorSuspended and ValidatorPrimedForSuspension events from the v0 and v1 versions of the accTransactions endpoint, but also excluded all regular transaction events.

Changes

• Revise the WHERE clause to behave correctly. In particular, allow the case where the tag is NULL.
• Bump version.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.