added RTD badge
added RTD badge

xdcesc/json,robertmrk/json,theodelrieu/json,xzmagic/json,stanmihai4/json,kaidokert/json,emvivre/json,hunter-packages/json,erichkeane/json,Newbrick/json,bestwpw/json,stanmihai4/json,nlohmann/json,stanmihai4/json,nickhen/json,Newbrick/json,kaidokert/json,AALEKH/json,daminetreg/json,Cloudage/json,Newbrick/json,hunter-packages/json,ruppmatt/json,hunter-packages/json,whackashoe/json,theodelrieu/json,nlohmann/json,kaidokert/json,silverweed/json,whackashoe/json,nlohmann/json,whoshuu/json,aestuarium/json