Warren Buffett seems to have overcome his famous reluctance to invest in digital technology. His Berkshire Hathaway disclosed this morning in an SEC filing that at the end of Q1 it owned 9.81 million shares of Apple, valued at more than $1 billion. Apple shares opened up 1.7% after the news. The disclosure follows the revelation during the weekend that Buffett is backing Quicken Loans founder Dan Gilbert in a bid for Yahoo. These developments suggest the legendary…