Add Travis CI status badge to README.md
Add Travis CI status badge to README.md

hillu/yara,plusvic/yara,plusvic/yara,tanium/yara,mgoffin/yara,wxsBSD/yara,VirusTotal/yara,rednaga/yara,kallanreed/yara,hillu/yara,mgoffin/yara,pombredanne/yara,rednaga/yara,pombredanne/yara,msuvajac/yara,tanium/yara,MeteorAdminz/yara,pombredanne/yara,MeteorAdminz/yara,cblichmann/yara,bmagistro/yara,cblichmann/yara,cblichmann/yara,msuvajac/yara,mgoffin/yara,bmagistro/yara,wxsBSD/yara,hillu/yara,pombredanne/yara,VirusTotal/yara,pombredanne/yara,wxsBSD/yara,plusvic/yara,plusvic/yara,jpypi/yara,hillu/yara,VirusTotal/yara,bmagistro/yara,hillu/yara,mgoffin/yara,MeteorAdminz/yara,tanium/yara,kallanreed/yara,wxsBSD/yara,jpypi/yara,VirusTotal/yara,kallanreed/yara,cblichmann/yara,plusvic/yara,VirusTotal/yara,rednaga/yara,jpypi/yara,msuvajac/yara,wxsBSD/yara,cblichmann/yara