Bump blockstack from 0.15.1 to 19.3.0

[dependabot-preview[bot]]

Bumps blockstack from 0.15.1 to 19.3.0.

Changelog

*Sourced from [blockstack's changelog](https://github.com/blockstack/blockstack.js/blob/master/CHANGELOG.md).* > ## [19.3.0] - 2019-08-21 > > ### Changed > - Fixed deprecated crypto warning in node.js usage. > - `handlePendingSignIn` now throws an error when overwriting an existing user session. See issue [#680](https://github-redirect.dependabot.com/blockstack/blockstack.js/issues/680) > - Updated jsontokens library to v2. > > ## [19.2.2] - 2019-05-12 > > ### Changed > - Updated bitcoinjs-lib dependency to v5 and eliminates node-gyp errors on install > - Fixed bugs when running in a web worker > > ## [19.2.0] - 2019-05-12 > > ### Added > - Method `deleteFile()` is now implemented > > ### Changed > - Fixed return type for BlockstackNetwork.getAccountTokens > - Property `manifestURI` is now included in loaded manifest object > - The `src` directory is now included in the npm package > > ## [19.1.0] - 2019-03-29 > > ### Added > - Converted codebase to Typescript > - New `dist/blockstack.js` bundle with ES2015/ES6 support > - `lib/**/*.js modules with Node v8.x support (ES2015/ES6 & CommonJS modules) > > ### Changed > - Fixed protocol handler detection issues with modular usage of blockstack.js > > ## [19.0.1] - 2019-03-12 > > ### Added > - New function `getFileUrl()` will return a URL for reading a particular file > from an applications' Gaia bucket. > > ### Changed > - Fixed the email authentication scope > - Fixed multiple bugs with `redirectToSignIn()` and `makeAuthRequest()` > > ## [19.0.0] - 2019-02-21 > > ### Added > > - Moved common user session related functions into `UserSession`. Session configuration is > done through AppConfig objects. This change removes the library's dependency on browser > environments. > ... (truncated)

Commits

- [`660f6e7`](https://github.com/blockstack/blockstack.js/commit/660f6e747c48c235dec8264784a0a46f091cb77c) Merge branch 'release/v19.3.0' - [`91316d3`](https://github.com/blockstack/blockstack.js/commit/91316d323b45e5b847a8b26fce7fba5defb4c382) Bump to v19.3.0 - [`1152bcd`](https://github.com/blockstack/blockstack.js/commit/1152bcd7a40b5a930300a1ad61399af4948c238b) Merge pull request [#701](https://github-redirect.dependabot.com/blockstack/blockstack.js/issues/701) from blockstack/feature/release-checklist - [`9d6f8a1`](https://github.com/blockstack/blockstack.js/commit/9d6f8a1c47a3d464e49cecbb506dde4664fb656d) Merge branch 'master' into feature/release-checklist - [`47ff342`](https://github.com/blockstack/blockstack.js/commit/47ff342e8026c1c737a330427a3d7e6c7fda5bde) Merge pull request [#706](https://github-redirect.dependabot.com/blockstack/blockstack.js/issues/706) from blockstack/fix/git-language-stats - [`71a6ed4`](https://github.com/blockstack/blockstack.js/commit/71a6ed475f5ab2c422f4ae19c00ac30c4c9ed05c) Exclude with *`html` -- linguist may not support blob syntax - [`7a129cc`](https://github.com/blockstack/blockstack.js/commit/7a129cc0f4ea80f31516a90fd4a93253f7c08d1d) no message - [`e70e3cb`](https://github.com/blockstack/blockstack.js/commit/e70e3cbcd7f531870319427feee4e7cf22b04e84) Updates to release checklist - [`1bdb40f`](https://github.com/blockstack/blockstack.js/commit/1bdb40f89f53a189043dacb520bc91eb3925746a) Update release-checklist.md - [`5e2b4de`](https://github.com/blockstack/blockstack.js/commit/5e2b4de1ac7edc1f093f62d8290ed320b72b6238) Update readme.md to add pull request template ref - Additional commits viewable in [compare view](https://github.com/blockstack/blockstack.js/compare/v0.15.1...v19.3.0)

Maintainer changes

This version was pushed to npm by [yknl](https://www.npmjs.com/~yknl), a new releaser for blockstack since your current version.

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[dependabot-preview[bot]]

Looks like blockstack is up-to-date now, so this is no longer needed.