README: update swig notes
README: update swig notes

add python, required version notes

Change-Id: Iec2e94075f6cf54455ce5a658f9b7258109f4d01

altogother/webm.libwebp,jacklicn/libwebp,gshORTON/webm.libwebp,kalli123/webm.libwebp,keane83/BLE_IM,iniwf/webm.libwebp,ya7lelkom/libwebp,ttyangf/libwebp,webmproject/libwebp,ttyangf/libwebp,yohunl/libwebp,jiehu5114/libwebp,kalli123/webm.libwebp,kleopatra999/webm.libwebp,Acidburn0zzz/webm.libwebp,matanbs/webm.libwebp,PKRoma/libwebp,Tekserve/libwebp,appunite/libwebp,kim42083/webm.libwebp,webmproject/libwebp,ttyangf/libwebp,Aexyn/libwebp,zofuthan/libwebp,iniwf/webm.libwebp,Suvarna1488/webm.libwebp,zofuthan/libwebp,abwiz0086/webm.libwebp,keane83/BLE_IM,ttyangf/libwebp,ericmckean/webm.libwebp,ericmckean/webm.libwebp,gshORTON/webm.libwebp,imazen/libwebp,yohunl/libwebp,appunite/libwebp,comoyo/gonzo-libwebp,Maria1099/webm.libwebp,imazen/libwebp,yohunl/libwebp,keane83/BLE_IM,rxl194/libwebp,yohunl/libwebp,kleopatra999/webm.libwebp,ericmckean/webm.libwebp,comoyo/gonzo-libwebp,altogother/webm.libwebp,appunite/libwebp,matanbs/webm.libwebp,kalli123/webm.libwebp,rxl194/libwebp,matanbs/webm.libwebp,ericmckean/webm.libwebp,redengineer/libwebp,Maria1099/webm.libwebp,imazen/libwebp,reimaginemedia/webm.libwebp,PKRoma/libwebp,redengineer/libwebp,ya7lelkom/libwebp,reimaginemedia/webm.libwebp,Suvarna1488/webm.libwebp,kleopatra999/webm.libwebp,kalli123/webm.libwebp,abwiz0086/webm.libwebp,zofuthan/libwebp,comoyo/gonzo-libwebp,matanbs/webm.libwebp,comoyo/gonzo-libwebp,webmproject/libwebp,altogother/webm.libwebp,webmproject/libwebp,Acidburn0zzz/webm.libwebp,reimaginemedia/webm.libwebp,imazen/libwebp,jacklicn/libwebp,redengineer/libwebp,jacklicn/libwebp,abwiz0086/webm.libwebp,kim42083/webm.libwebp,Aexyn/libwebp,keane83/BLE_IM,appunite/libwebp,kalli123/webm.libwebp,Maria1099/webm.libwebp,altogother/webm.libwebp,rxl194/libwebp,abwiz0086/webm.libwebp,keane83/BLE_IM,appunite/libwebp,zofuthan/libwebp,kim42083/webm.libwebp,iniwf/webm.libwebp,webmproject/libwebp,Maria1099/webm.libwebp,comoyo/gonzo-libwebp,redengineer/libwebp,Suvarna1488/webm.libwebp,reimaginemedia/webm.libwebp,matanbs/webm.libwebp,yohunl/libwebp,ya7lelkom/libwebp,Aexyn/libwebp,gshORTON/webm.libwebp,Aexyn/libwebp,PKRoma/libwebp,PKRoma/libwebp,ya7lelkom/libwebp,redengineer/libwebp,abwiz0086/webm.libwebp,comoyo/gonzo-libwebp,appunite/libwebp,PKRoma/libwebp,ya7lelkom/libwebp,jacklicn/libwebp,Tekserve/libwebp,kleopatra999/webm.libwebp,jacklicn/libwebp,iniwf/webm.libwebp,jiehu5114/libwebp,comoyo/gonzo-libwebp,altogother/webm.libwebp,imazen/libwebp,iniwf/webm.libwebp,Tekserve/libwebp,ericmckean/webm.libwebp,rxl194/libwebp,Suvarna1488/webm.libwebp,jiehu5114/libwebp,kim42083/webm.libwebp,gshORTON/webm.libwebp,jiehu5114/libwebp,Aexyn/libwebp,Maria1099/webm.libwebp,ttyangf/libwebp,kim42083/webm.libwebp,Acidburn0zzz/webm.libwebp,kleopatra999/webm.libwebp,Suvarna1488/webm.libwebp,rxl194/libwebp,jiehu5114/libwebp,gshORTON/webm.libwebp,reimaginemedia/webm.libwebp,Acidburn0zzz/webm.libwebp,Tekserve/libwebp,zofuthan/libwebp,Acidburn0zzz/webm.libwebp,PKRoma/libwebp