3.1.0

• Upgrade dependencies (9272a9d)
• Fix IE11 (#56) (2aafc33)
• Ensure all packages are installed from npm registry (0acff15)
• Add badges (9905e12)
• Bump coveralls from 3.0.5 to 3.0.6 (#49) (851127c)
• [Security] Bump eslint-utils from 1.4.0 to 1.4.2 (#54) (51066e2)
• Bump @open-wc/karma-esm from 2.2.8 to 2.5.2 (#51) (fa7aace)
• Bump eslint from 6.1.0 to 6.2.2 (#53) (5b027db)
• Bump rollup from 1.20.1 to 1.20.2 (#52) (9644d32)
• Bump rollup-plugin-typescript2 from 0.22.1 to 0.23.0 (#50) (b3c30cc)
• Bump rollup from 1.18.0 to 1.20.1 (#47) (57bf7ac)
• Bump karma-coverage from 1.1.2 to 2.0.1 (#48) (2720066)
• Bump karma-chrome-launcher from 3.0.0 to 3.1.0 (#45) (db12b38)
• Bump @types/chai from 4.1.7 to 4.2.0 (#46) (9ddc5be)
• Bump sinon from 7.4.0 to 7.4.1 (#44) (a35b91e)