fix: add files prop to package.json to reduce publish size

[tuananh]

currently this package is published with lots of unneeded files. i also remove lock file because package kind of dont need that and you also use latest in package.json anyway.

current

npm notice === Tarball Details === 
npm notice name:          ahocorasick                             
npm notice version:       1.0.2                                   
npm notice package size:  15.6 kB                                 
npm notice unpacked size: 39.4 kB                                 
npm notice shasum:        61645106387822d70648dff2e7202e7d18c926ce
npm notice integrity:     sha512-Ljmszaby0hvqv[...]zKdQjvu8lxqCQ==
npm notice total files:   10                                      
npm notice 
+ [email protected]

after

npm notice === Tarball Details === 
npm notice name:          ahocorasick                             
npm notice version:       1.0.2                                   
npm notice package size:  2.3 kB                                  
npm notice unpacked size: 5.6 kB                                  
npm notice shasum:        53692126da0ad8758211189cd6f09467639660bc
npm notice integrity:     sha512-y+2Yr3P3B7ArG[...]Z3VOxiQ5r+K7w==
npm notice total files:   4                                       
npm notice 
+ [email protected]