ffmpeg.wasm v0.11.0

Thanks to following contributors to make this release happen! 🎉 🎉

• Add mainName option，the main function name of custom ffmpeg-core.js script. And catch the exit Error. (#235) @seminelee
• Fix exit method (#274, #296 , #346 ) @swaylq, @pikax, @cainiaokan
• Update typings (#275 ) @fytriht
• Add FS readdir types (#283 ) @linguofeng
• refactor: Remove unused webpack import (#327 ) @duncanbeevers
• build: Remove --experimental-wasm-bulk-memory flag (#328 ) @duncanbeevers
• Fix overwriting variables when running multiple instances (#329) @rosenrose
• Web Worker Support (#341) @nxtexe
• use stringToUTF8() not writeAsciiToMemory() (#352 ) @cs8425
• expose more FS methods to ts (#369 ) @Jeffxz
• add wasmPath & workerPath as browser options (#375) @JackCA