docs: Bump version to 1.5.1.
docs: Bump version to 1.5.1.

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ma/micropython,TDAbboud/micropython,pramasoul/micropython,alex-march/micropython,redbear/micropython,alex-robbins/micropython,SHA2017-badge/micropython-esp32,mpalomer/micropython,dxxb/micropython,mianos/micropython,turbinenreiter/micropython,oopy/micropython,kerneltask/micropython,henriknelson/micropython,trezor/micropython,blazewicz/micropython,Timmenem/micropython,dxxb/micropython,pozetroninc/micropython,torwag/micropython,pramasoul/micropython,adafruit/circuitpython,martinribelotta/micropython,misterdanb/micropython,hiway/micropython,alex-march/micropython,danicampora/micropython,micropython/micropython-esp32,blazewicz/micropython,emfcamp/micropython,ryannathans/micropython,torwag/micropython,swegener/micropython,selste/micropython,cwyark/micropython,toolmacher/micropython,oopy/micropython,mpalomer/micropython,mianos/micropython,micropython/micropython-esp32,MrSurly/micropython,puuu/micropython,cwyark/micropython,adafruit/micropython,praemdonck/micropython,torwag/micropython,supergis/micropython,blmorris/micropython,infinnovation/micropython,matthewelse/micropython,cwyark/micropython,dmazzella/micropython,neilh10/micropython,Timmenem/micropython,adafruit/circuitpython,pfalcon/micropython,alex-robbins/micropython,hosaka/micropython,toolmacher/micropython,ernesto-g/micropython,adamkh/micropython,blmorris/micropython,MrSurly/micropython-esp32,swegener/micropython,galenhz/micropython,misterdanb/micropython,praemdonck/micropython,MrSurly/micropython,SHA2017-badge/micropython-esp32,redbear/micropython,dxxb/micropython,chrisdearman/micropython,MrSurly/micropython,bvernoux/micropython,dinau/micropython,swegener/micropython,tobbad/micropython,adafruit/circuitpython,torwag/micropython,supergis/micropython,AriZuu/micropython,lowRISC/micropython,ernesto-g/micropython,mhoffma/micropython,SHA2017-badge/micropython-esp32,tobbad/micropython,lowRISC/micropython,tralamazza/micropython,redbear/micropython,mhoffma/micropython,tobbad/micropython,henriknelson/micropython,redbear/micropython,neilh10/micropython,turbinenreiter/micropython,alex-march/micropython