v1.15.2

Fixed

• Use more accurate line information for pprof profiles [#430] (by @dalehamel)
• Stackprof: weight on-cpu samples by period rather than timestamp delta [#425] (by @manuelfelipe)
• Prevent crashes when stackprof profiles frames are missing names [#419] (by @jez)
• fix pprof defaultSampleType [#424] (by @vasi-stripe)