Drop the old `\PHPExcel_Calculation_Functions::VERSION()`

This fucntion does not exist in Excel and it is non trivial to implement
without svn. Thus it was incorrect for many releases.

CHANGELOG.md

@@ -36,6 +36,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 For a comprehensive list of all class changes, and a semi-automated migration path, read the [migration guide](./docs/Migration-from-PHPExcel.md).
 
+- Dropped `\PHPExcel_Calculation_Functions::VERSION()`. Composer or git should be used to know the version.
+
 ## [1.8.1] - 2015-04-30
 
 ### Bugfixes

docs/Functions/Function-list-by-category.md

@@ -179,7 +179,6 @@ ISTEXT              | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_TEXT
 N                   | \PhpOffice\PhpSpreadsheet\Calculation\Functions::N
 NA                  | \PhpOffice\PhpSpreadsheet\Calculation\Functions::NA
 TYPE                | \PhpOffice\PhpSpreadsheet\Calculation\Functions::TYPE
-VERSION             | \PhpOffice\PhpSpreadsheet\Calculation\Functions::VERSION
 
 ## CATEGORY_LOGICAL
 

docs/Functions/Function-list-by-name.md

@@ -451,7 +451,6 @@ VARA                | CATEGORY_STATISTICAL           | \PhpOffice\PhpSpreadsheet
 VARP                | CATEGORY_STATISTICAL           | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARP
 VARPA               | CATEGORY_STATISTICAL           | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARPA
 VDB                 | CATEGORY_FINANCIAL             | **Not yet Implemented**
-VERSION             | CATEGORY_INFORMATION           | \PhpOffice\PhpSpreadsheet\Calculation\Functions::VERSION
 VLOOKUP             | CATEGORY_LOOKUP_AND_REFERENCE  | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::VLOOKUP
 
 ## W

src/PhpSpreadsheet/Calculation.php

@@ -1948,11 +1948,6 @@ class Calculation
             'functionCall' => 'Calculation\Categories::DUMMY',
             'argumentCount' => '5-7',
         ],
-        'VERSION' => [
-            'category' => Calculation\Categories::CATEGORY_INFORMATION,
-            'functionCall' => 'Calculation\Categories::VERSION',
-            'argumentCount' => '0',
-        ],
         'VLOOKUP' => [
             'category' => Calculation\Categories::CATEGORY_LOOKUP_AND_REFERENCE,
             'functionCall' => '\\PhpOffice\\PhpSpreadsheet\\Calculation\\LookupRef::VLOOKUP',

src/PhpSpreadsheet/Calculation/Functions.php

@@ -472,16 +472,6 @@ class Functions
         return !self::isText($value);
     }
 
-    /**
-     * VERSION
-     *
-     * @return    string    Version information
-     */
-    public static function VERSION()
-    {
-        return 'PhpSpreadsheet ##VERSION##, ##DATE##';
-    }
-
     /**
      * N
      *

src/PhpSpreadsheet/Calculation/functionlist.txt

@@ -335,7 +335,6 @@ VARA
 VARP
 VARPA
 VDB
-VERSION
 VLOOKUP
 WEEKDAY
 WEEKNUM