Fix spacing in README.md

Author: Micah Parks

README.md

@@ -105,5 +105,5 @@ ok      github.com/MicahParks/peakdetect        0.019s
 
 # References
 Brakel, J.P.G. van (2014). "Robust peak detection algorithm using z-scores". Stack Overflow. Available
-at: https://stackoverflow.com/questions/22583391/peak-signal-detection-in-realtime-timeseries-data/22640362#22640362 (
-version: 2020-11-08).
+at: https://stackoverflow.com/questions/22583391/peak-signal-detection-in-realtime-timeseries-data/22640362#22640362
+(version: 2020-11-08).