added @mcollina to contributors list
added @mcollina to contributors list

jhead/leveldown,Level/leveldown,MathieuCassagne/leveldown,timkuijsten/leveldown,phillipj/leveldown,chjj/rocksdown,juliangruber/a-native-module,Level/rocksdb,Level/leveldown,MathieuCassagne/leveldown,timkuijsten/leveldown,Level/leveldown-mobile,juliangruber/a-native-module,gastrodia/leveldown,chjj/rocksdown,timkuijsten/leveldown,juliangruber/a-native-module-without-prebuild,juliangruber/a-native-module-without-prebuild,No9/leveldown,No9/leveldown,chjj/rocksdown,chjj/rocksdown,jhead/leveldown,jmanero/flat-rocks,jmanero/flat-rocks,MathieuCassagne/leveldown,MathieuCassagne/leveldown,gastrodia/leveldown,phillipj/leveldown,phillipj/leveldown,mafintosh/leveldown-prebuilt,Level/leveldown-mobile,Level/rocksdb,snowyu/node-nosql-leveldb,jmanero/flat-rocks,mafintosh/leveldown-prebuilt,gastrodia/leveldown,MathieuCassagne/leveldown,jhead/leveldown,juliangruber/a-native-module-without-prebuild,Level/leveldown-mobile,juliangruber/a-native-module,ralphtheninja/leveldown,gastrodia/leveldown,gastrodia/leveldown,juliangruber/a-native-module-without-prebuild,ralphtheninja/leveldown,jmanero/flat-rocks,jmanero/flat-rocks,ralphtheninja/leveldown,phillipj/leveldown,mafintosh/leveldown-prebuilt,jhead/leveldown,ralphtheninja/leveldown,No9/leveldown,juliangruber/a-native-module-without-prebuild,Level/rocksdb,phillipj/leveldown,No9/leveldown,snowyu/node-nosql-leveldb,timkuijsten/leveldown,mafintosh/leveldown-prebuilt,snowyu/node-nosql-leveldb,timkuijsten/leveldown,Level/leveldown-mobile,Level/leveldown-mobile,Level/leveldown,jhead/leveldown,snowyu/node-nosql-leveldb,juliangruber/a-native-module,mafintosh/leveldown-prebuilt,snowyu/node-nosql-leveldb,No9/leveldown,ralphtheninja/leveldown,juliangruber/a-native-module