Update package.json

[frankkienl]

Fixes #5:

node:internal/modules/cjs/loader:361
      throw err;
      ^

Error: Cannot find module '/Users/frankbouwens/priv/SOME_PROJECT/node_modules/@2toad/diff-match-patch/diff_match_patch.js'. Please verify that the package.json has a valid "main" entry

[JasonPierce]

Thanks for the PR Frank. Will you please send me the Node and NPM versions you are using so I can reproduce and test this?

[frankkienl]

Hi Jason,

Here are my node and npm versions:

node: v16.14.2 
npm: 8.5.0

I noticed that the file:
https://github.com/2Toad/diff-match-patch/blob/400fc9962afa78df9d55a12b1ba1e2df31f3cf80/diff-match-patch.js
is named "diff-match-patch.js" with -'s
and the file:

diff-match-patch/package.json

Line 12 in 400fc99

"main": "diff_match_patch.js",

mentions that same file, but with _ instead of -.
When I changed the package.json file as in this PR, the error disappeared.

Hope this helps!

[JasonPierce]

Thanks Frank!

Will you pleas merge latest master into your branch? I've replaced the defunct Travis CI build script with new GitHub Actions, which will test your changes against the supported Node versions

[frankkienl]

Fetched changes from upstream. Master should be merged now ;-) !