Fixed broken link in README.

[appsandwich]

Fixed the broken Quick Start Guide link under the Installation (CocoaPods) section.

Description

Changed the link from Quick Start Guide to quick-start-guide.

Motivation and Context

Fixes broken docs, massively reducing confusion! ;)

How Has This Been Tested?

Forked and confirmed that the link works.

Checklist:

For all changes:

• [ ] Is there an issue associated with this PR? Is it referenced in the commit message?
• [x] Has your PR been rebased against the latest commit within the target branch (typically master)?
• [x] Is your initial contribution a single, squashed commit?

For code changes:

• [ ] Avoid other runtime dependencies
• [ ] Have you written or updated unit tests to verify your changes?
• [ ] Have you ensured that the full suite of tests is executed via make tests in the cmake-build-debug` directory off the root of the project?
• [ ] If applicable, have you updated the documentation?
• [ ] If applicable, have you updated the CHANGELOG.md file?

For documentation related changes:

• [x] Have you ensured that format looks appropriate for the output in which it is rendered?

Note:

Please ensure that once the PR is submitted, you check travis-ci for build issues and submit an update to your PR as soon as possible.

[codecov[bot]]

Codecov Report

Merging #98 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files          27       27           
  Lines         787      787           
=======================================
  Hits          785      785           
  Misses          2        2