README: Remove blank line from infrastructure-agnostic paragraph
README: Remove blank line from infrastructure-agnostic paragraph

talwai/specs,wking/opencontainer-specs,vbatts/specs,laijs/specs,ujuc/specs,sladage/specs,ChengTiesheng/specs,wangkirin/specs,vishh/specs,hqhq/runtime-spec,navidshaikh/specs,opencontainers/specs,jhjeong-kr/specs,gao-feng/specs,cloudfoundry-incubator/specs,zenlinTechnofreak/specs,opencontainers/runtime-spec,LK4D4/specs,rootfs/specs,runcom/specs,dustymabe/specs,wking/opencontainer-runtime-spec,HardikDR/specs,marcosnils/specs,kensipe/specs,philips/specs,mheon/specs,haijunTan/specs,hqhq/specs,jonboulle/specs