Update grunt requirement from ~0.4.1 to ~1.0.3

[dependabot-preview]

Updates the requirements on grunt to permit the latest version.

Changelog

Sourced from grunt's changelog.

v1.0.3
date: 2018-06-03
changes:
- Drop support for Node 0.10 and 0.12.
- Dependency updates: rimraf, grunt-legacy-log, grunt-legacy-util.
- Fix race condition with file.mkdir.
v1.0.2
date: 2018-02-07
changes:
- Fix for readYAML error messages.
- Remove deprecation warning for coffeescript. Pull #1621.
v1.0.1
date: 2016-04-05
changes:
- minor fix for npm issues when installing grunt and grunt-cli at the same time. Pull #1500.
v1.0.0
date: 2016-04-04
changes:
- full list of changes is on http://gruntjs.com, please also see changes from 1.0.0-rc1.
- if you have a Grunt plugin that includes grunt in the peerDependencies,
we recommend tagging with "grunt": "">= 0.4.0" and publishing a new version on npm.
- Prevent async callback from being called multiple times. Pull #1464.
- Update copyright to jQuery Foundation and remove redundant headers. Fixes #1478.
- Update glob to 7.0.x. Fixes #1467.
- Removing duplicate BOM strip code. Pull #1482.
- Update legacy log and util to 1.0.0.
- Update to latest cli ~1.2.0.
- Use grunt-known-options for shared options between Grunt and grunt-cli.
v1.0.0-rc1
date: 2016-02-11
changes:
- full list of changes is on http://gruntjs.com
- if you have a Grunt plugin that includes grunt in the peerDependencies,
we recommend tagging with "grunt": "">= 0.4.0"
- coffee-script is upgraded to ~1.10.0 which could incur breaking changes
when using the language with plugins and Gruntfiles.
- nopt is upgraded to ~3.0.6 which has fixed many issues, including passing
multiple arguments and dealing with numbers as options. Be aware previously
--foo bar used to pass the value 'bar' to the option foo. It will now
set the option foo to true and run the task bar.
-glob is upgraded to ~6.0.4 and minimatch is upgraded to ~3.0.0. Results
are now sorted by default with grunt.file.expandMapping(). Pass the
nosort: true option if you don't want the results to be sorted.
- lodash was upgraded to ~4.3.0. Many changes have occurred. Some of which
that directly effect Grunt are grunt.util._.template() returns a compile
function and grunt.util._.flatten no longer flattens deeply.
grunt.util._ is deprecated and we highly encourage you to
npm install lodash and var _ = require('lodash') to use lodash.
Please see the lodash changelog for a full list of changes: https://github.com/lodash/lodash/wiki/Changelog
- iconv-lite is upgraded to ~0.4.13 and strips the BOM by default.

... (truncated)

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[dependabot-preview]

Superseded by #27.