Specify which files are included in npm package

[lukaw3d]

npm package >=1.4.0 includes quite a bit of clutter (https://app.renovatebot.com/package-diff?name=typed-redux-saga&from=1.3.1&to=1.5.0)

npm pack differences: this PR vs typed-redux-saga@1.5.0

- npm notice 82B    .babelrc                                  
- npm notice 39B    .eslintignore                             
- npm notice 4B     .nvmrc                                    
  npm notice 1.1kB  LICENSE                                   
- npm notice 5.4kB  coverage/lcov-report/base.css             
- npm notice 676B   coverage/lcov-report/prettify.css         
- npm notice 4.2kB  coverage/lcov-report/index.html           
- npm notice 6.7kB  coverage/lcov-report/macro.js.html        
- npm notice 228B   coverage/lcov.info                        
- npm notice 2.4kB  coverage/lcov-report/block-navigation.js  
  npm notice 3.9kB  dist/cjs/index.js                         
  npm notice 3.8kB  dist/es/index.js                          
  npm notice 4.1kB  src/index.js                              
  npm notice 907B   dist/cjs/macro.js                         
  npm notice 844B   dist/es/macro.js                          
  npm notice 977B   src/macro.js                              
- npm notice 817B   tests/macro.test.js                       
- npm notice 17.6kB coverage/lcov-report/prettify.js          
- npm notice 638B   rollup.config.js                          
- npm notice 5.3kB  coverage/lcov-report/sorter.js            
- npm notice 1.6kB  coverage/coverage-final.json              
- npm notice 124B   macro/package.json                        
  npm notice 3.0kB  package.json                              
- npm notice 321B   renovate.json                             
- npm notice 556B   tsconfig.json                             
  npm notice 406B   types/tsconfig.json                       
  npm notice 294B   types/tslint.json                         
  npm notice 3.9kB  README.md                                 
- npm notice 1.1kB  templates/index.js.njk                    
- npm notice 540B   coverage/lcov-report/favicon.png          
- npm notice 209B   coverage/lcov-report/sort-arrow-sprite.png
- npm notice 1.2kB  tests/__snapshots__/macro.test.js.snap    
- npm notice 827B   generateTemplates.ts                      
  npm notice 15.8kB dist/index.d.ts                           
  npm notice 15.8kB types/index.d.ts                          
  npm notice 7.3kB  types/index.test.ts                       
  npm notice 19B    dist/macro.d.ts                           
  npm notice 19B    types/macro.d.ts                          
  npm notice 421B   types/macro.test.ts                       
- npm notice 189B   typings/types.d.ts                        
- npm notice 1.0kB  coverage/clover.xml                       
- npm notice 685B   .eslintrc.yml                             
- npm notice 190B   .travis.yml                               
- npm notice 143B   .github/depedabot.yml   

npm pack differences: this PR vs typed-redux-saga@1.3.0

- .babelrc                              
- .eslintignore                         
- .nvmrc                                
  LICENSE                               
  dist/cjs/index.js                     
  dist/es/index.js                      
  src/index.js                          
  dist/cjs/macro.js                     
  dist/es/macro.js                      
  src/macro.js                          
- tests/macro.test.js                   
- rollup.config.js                      
  package.json                          
- tsconfig.json                         
  types/tsconfig.json                   
  types/tslint.json                     
  README.md                             
- templates/index.js.njk                
- tests/__snapshots__/macro.test.js.snap
- generateTemplates.ts                  
  dist/index.d.ts                       
  types/index.d.ts                      
  types/index.test.ts                   
  dist/macro.d.ts                       
  types/macro.d.ts                      
  types/macro.test.ts                   
- .eslintrc.yml                         
- .travis.yml