Update psr/http-message requirement from ^1.0 to ^2.0

[dependabot]

Updates the requirements on psr/http-message to permit the latest version.

Release notes

Sourced from psr/http-message's releases.

2.0

Added return types, see https://www.php-fig.org/psr/psr-7/meta/#72-type-additions

Changelog

Sourced from psr/http-message's changelog.

Changelog

All notable changes to this project will be documented in this file, in reverse chronological order by release.

1.0.1 - 2016-08-06

Added

• Nothing.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• Updated all @return self annotation references in interfaces to use @return static, which more closelly follows the semantics of the specification.
• Updated the MessageInterface::getHeaders() return annotation to use the value string[][], indicating the format is a nested array of strings.
• Updated the @link annotation for RequestInterface::withRequestTarget() to point to the correct section of RFC 7230.
• Updated the ServerRequestInterface::withUploadedFiles() parameter annotation to add the parameter name ($uploadedFiles).
• Updated a @throws annotation for the UploadedFileInterface::moveTo() method to correctly reference the method parameter (it was referencing an incorrect parameter name previously).

1.0.0 - 2016-05-18

Initial stable release; reflects accepted PSR-7 specification.

Commits

• 402d35b Merge pull request #95 from Stilch/add-param-and-return-type-hints
• 947607b Merge branch 'master' into add-param-and-return-type-hints
• cb6ce48 Merge pull request #94 from Stilch/add-param-hints
• 3def521 Added void as return types
• 520dd0e Added string as return types for __toString
• 6ae06cd Added a string typehint for the $requestTarget argument
• f84c2d7 Changed php version
• 641e9f8 Changed the requirements for the PHP version and removed declare strict types
• 54df5d4 Add return typehints
• 5cd5ad7 Adds parameter typehints
• Additional commits viewable in compare view

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Fix #139

[what-the-diff]

PR Summary

• Update to Dependency Version in the composer.json File
  The version requirement for a key component, psr/http-message has been updated. This means our program is now using the more current version(^2.0) of this component, instead of the older version (^1.0). As a result, we can expect better performance and the availability of new features provided by the updated component. Not to mention, staying up-to-date with these types of dependencies can also enhance the overall security of our application.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bc3eb5e) 99.48% compared to head (baa2180) 99.48%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #141   +/-   ##
=========================================
  Coverage     99.48%   99.48%           
  Complexity       85       85           
=========================================
  Files             2        2           
  Lines           195      195           
=========================================
  Hits            194      194           
  Misses            1        1           

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