Merge pull request #23 from jescalan/readme

Small docs correction ✨

Author: developit

README.md

@@ -41,7 +41,7 @@ Microbundle includes two commands - `build` (the default) and `watch`. Neither r
 ### `microbundle` / `microbundle build`
 
 By default, microbundle will infer the location of your source entry file
-(the root module in your program) from the `module` field in your `package.json`. It will infer the output directory and filename(s) from the `main` field. For UMD builds, microbundle will use a snake case version of the `name` field in your `package.json` for the export name; you can also specify a name via an `amdName` field or the `name` CLI option.
+(the root module in your program) from the `source` field in your `package.json`. It will infer the output directory and filename(s) from the `main` field. For UMD builds, microbundle will use a snake case version of the `name` field in your `package.json` for the export name; you can also specify a name via an `amdName` field or the `name` CLI option.
 
 ### `microbundle watch`