By Praveen Paramasivam, Maria Ponnezhath and Dietrich Knauth (Reuters) -Revlon Inc has filed for bankruptcy after the U.S cosmetics firm buckled under debts it built up in a bid to compete with online-focused upstarts. Known for its nail polishes and lipsticks, the 90-year-old company listed assets and liabilities of between $1 billion and $10 billion in a court filing on Wednesday. Revlon, which was formed in 1932 by brothers Charles and Joseph Revson and Charles Lachman, has in recent years lost shelf space and sales to startups backed by celebrities such as Kylie Jenner’s Kylie Cosmetics an…