Added History.md

History.md

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+## v2.5.0
+
+* Improved the algorithm: it gets better with this release!
+* Added: ability to override default valid variables, that will allow to set variables with names not only x, y, z, a, b.
+* Added: History.md
+* Updated: readme
+
+## v2.4.0
+
+* Improved: now are available several consecutive operators, e.g. 10/--++2
+* Improved: a decimal number can be given as 1. or .1 which is equal to 1.0 or 0.1
+* Added: constant Inf
+* Added: processing of NaN
+* Added: unit tests
+* Fixed: PHP message "Notice: Undefined offset" in some cases
+* Refactored: class properties and names of several methods
+* Refactored: short syntax to arrays
+* Updated: composer.json
+* Updated: PHPDoc
+* Updated: readme
+
+## v2.3.0
+
+* Added: variables x, y, z, a, b
+* Added: constant e
+* Added: functions log, exp
+* Added: namespace
+* Added: composer.json
+* Updated: PHPDoc
+* Updated: readme
+
+## v2.2.0
+
+* Added: functions sqrt, abs, sin, cos, tan
+* Refactored: class properties
+* Fixed: PHPDoc
+* Updated: readme
+
+## v2.1.0
+
+* Improved the algorithm: it gets better with this release!
+* Improved: now spaces are allowed, like so: 8 + ( 10 * ( 3 + 5 ) ) / 2
+* Added: numbers in E notation
+* Added: constant pi
+* Added: new validation rules