Composers of recently added simutrans songs

[THLeaderH]

The composer of 43-Driving-on-the-midnight-highway and 44-Above-the-sky is kayolabo801, not Gobanboshi. Could you fix the composer statement in music/readme.txt?

The composer of 50-Where-Thomassons-Lie is Shingoushori. The composer of 51-Summer-Intersection is Gobanboshi. 52-Dreamy-Oriental-Nights was composed by RykSeb. And 53-Snowy-Road was composed by Ano-KTOK and arranged by RykSeb. Please update the credits of those songs 

[prissi]

Hopefully got this correct in r9032.