excel-builder-ts 0.4.0

Changed

• Update to TypeScript 2.8
• Update tsconfig.json with strictNullChecks: true, noImplicitReturns: true and forceConsistentCasingInFileNames: true
• Added release tarball and npm script build-package to package.json referencing external process to generate tarball
• Cleanup JSZip dependency:
  • ExcelBuilder.createFile() now requires a JSZip instance or object with file() method instead of creating a JSZip instance from a constructor function and generating the zip file. i.e. use ExcelBuilder.createFile(new JSZip(), ...).generateAsync(...) instead of previously using ExcelBuilder.createFile(JSZip, ...)
  • JSZip is only required if using ZipWorker