spec: explicitly reference SemVer 2.0.0
spec: explicitly reference SemVer 2.0.0

ChengTiesheng/spec,dustymabe/spec,marineam/spec,jonboulle/spec,appc/spec,jonboulle/spec,krnowak/appc-spec,dgonyeo/spec,endocode/appc-spec,endocode/appc-spec,iaguis/appc-spec,zenlinTechnofreak/spec,3ofcoins/appc-spec,squeed/spec,marineam/spec,3ofcoins/appc-spec,tklauser/spec,marineam/spec,squeed/spec,alban/appc-spec,apcera/appc-spec,krnowak/appc-spec,tklauser/spec,dustymabe/spec,zenlinTechnofreak/spec,craimbert/spec,dgonyeo/spec,apcera/appc-spec,stufflebear/spec,yifan-gu/spec,appc/spec,ChengTiesheng/spec,yifan-gu/spec,dustymabe/spec,apcera/appc-spec,stufflebear/spec,jonboulle/spec,iaguis/appc-spec,alban/appc-spec,ChengTiesheng/spec,stufflebear/spec,3ofcoins/appc-spec,alban/appc-spec,squeed/spec,krnowak/appc-spec,craimbert/spec,dgonyeo/spec,iaguis/appc-spec,tklauser/spec,appc/spec,endocode/appc-spec,craimbert/spec,zenlinTechnofreak/spec,yifan-gu/spec