Fixed missing minute_trend_times method
This PR fixes #465 (closed) by adding the missing gwpy.io.nds2.minute_trend_times
function that got forgotten in the confusion between #456 and #457, unit tests included.
This PR fixes #465 (closed) by adding the missing gwpy.io.nds2.minute_trend_times
function that got forgotten in the confusion between #456 and #457, unit tests included.