Fix space leak caused by updateMeasure
Fix space leak caused by updateMeasure

modifyIORef does not force the value, so if the Measurement object is updated a
bunch of times but never examined, the program will leak memory.

beni55/hs-tls,AaronFriel/hs-tls,beni55/hs-tls,tolysz/hs-tls,erikd/hs-tls,lancelotsix/hs-tls,AaronFriel/hs-tls,tolysz/hs-tls,lancelotsix/hs-tls,erikd/hs-tls