Update phpmath from 0.2.0 to 0.3.0 (#2785)

* Update phpmath

Release 0.3.0 has a security fix in it...

PHPOffice/Math@0.2.0...master

* Update Changelog 1.4.0.md

Author: eileenmcnaughton

composer.json

@@ -112,7 +112,7 @@
         "ext-zip": "*",
         "ext-json": "*",
         "ext-xml": "*",
-        "phpoffice/math": "^0.2"
+        "phpoffice/math": "^0.3"
     },
     "require-dev": {
         "ext-libxml": "*",

docs/changes/1.x/1.4.0.md

@@ -40,6 +40,7 @@
 - Adding the possibility to use iterate search and replace with setValues by [@moghwan](https://github.com/moghwan) in [#2632](https://github.com/PHPOffice/PHPWord/pull/2640)
 - Add test cases that test the ODTText and Word2007 reader using the corresponding writer, increasing test coverage by [@MichaelPFrey](https://github.com/MichaelPFrey) in [#2745](https://github.com/PHPOffice/PHPWord/pull/2745)
 - Updated TOCTest to use static HTML content instead of external resource [@michalschroeder](https://github.com/michalschroeder) in [#2784](https://github.com/PHPOffice/PHPWord/pull/2784)
+- Bump PHPOffice/math from 0.2.0 to 0.3.0 by [@eileenmcnaughton](https://github.com/eileenmcnaughton) in [#2785](https://github.com/PHPOffice/PHPWord/pull/2785)
 
 ### Deprecations
 - Deprecate `PhpOffice\PhpWord\Style\Paragraph::getIndent()` : Use `PhpOffice\PhpWord\Style\Paragraph::getIndentLeft()`