Filters a gdelt data frame to specified sources
filter_sources(
data,
sources = c("netsdaily", "realdeal", "curbed", "law360", "dailymail", "wsj.com",
"law360", "pehub", "techcrunch", "washingtonpost", "bloomberg", "archdaily",
"espn.com", "venturebeat")
)
gkg or vgkg data frame
vector of sources