Updated package version from 1.3.0 to 1.4.0 for NPM publish

Merge pull request bit-dream#9 from bit-dream/feature-synchronous-loa…

…ding

Feature synchronous loading

Merge pull request bit-dream#3 from bit-dream/optimize-decode-method

Optimize decode method

Merge pull request bit-dream#1 from bit-dream/feat-add-can-decode

Feat add can decode

Updated readme. Updated package version. Added small modification to …

…writer class so that it overwrites file rather than appending data when reruning .write()

Updated package version and main file. index.ts now exports Dbc class…

… so that it can be imported via a package