Expose intensityValueToZoneType() function

src/index.ts

@@ -7,7 +7,7 @@ export { parseCliOptions } from "./parseCliOptions";
 export { Workout, Interval, Comment } from "./ast";
 export { Duration } from "./Duration";
 export { Intensity, ConstantIntensity, RangeIntensity, FreeIntensity } from "./Intensity";
-export { ZoneType } from "./ZoneType";
+export { ZoneType, intensityValueToZoneType } from "./ZoneType";
 
 // utils
 export { totalDuration } from "./stats/totalDuration";