Added a CHANGELOG

Author: jb-lopez

CHANGELOG.md

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+# Change Log
+
+## 1.2.0
+  * Added the static variable to the test. Use this instead of a string just in case the string for the errors change.
+  * Test all of the MA types that stochrsi supports.
+  * Added some test data that matches [Issue #2](https://github.com/LupeCode/phpTraderNative/issues/2).
+  * Added the Lupe Trader classes.
+    * These classes will override certain functions that have been identified to produce bad results.
+    * See [Issue #2](https://github.com/LupeCode/phpTraderNative/issues/2).
+  * Wrote tests with hand-done math to verify that the returned results match what it should be.
+    * There were already tests that made sure the results matched the PECL Trader extension, but what if that was wrong?
+    * I didn't to it by hand *per se*, but in a spreadsheet. I'm not *that* good at math.
+  * Added the Slow Stoch RSI function to solve [Issue #2](https://github.com/LupeCode/phpTraderNative/issues/2).
+  * Moved the common testing data into a trait for classes that cannot extend the `TraderTest` class.
+  * Added the `.gitlab-ci.yml` and `.travis.yml` files.
+    * Hey, who can say no to free code testing and reporting, right?
+## 1.1.0
+  * Removed the MyInteger class, using plain integers now.
+  * Made the return message constant and easier to test against.
+  * Switched to using the core classes in a static way. This will improve operating time when the same class of functions are used multiple times in one execution.
+  * Added tests that cause coverage to hang with a group that can be skipped with `--exclude-group exceptions`
+  * Updated the static references.
+## 1.0.5
+  * Added an installation notice to the README.
+## 1.0.4
+  * Fixed [Issue # 1](https://github.com/LupeCode/phpTraderNative/issues/1)
+  * Shortened the code for htDcPeriod.
+## 1.0.3
+  * Added a test that shows that the PECL version and the C/JAVA versions of TA-Lib have different defaults.
+  * Added testing for the TraderFriendly class.
+  * Changed the version requirement of PECL Trader to 0.4.1 for require-dev.
+  * Removed unused internal functions.
+## 1.0.2
+  * Updated for PECL Trader version 0.4.1.
+  * Optimized the code.
+  * Made sure that the original copyright notice was in all of the ported code.
+  * Set up local tests to be in multiple versions of PHP; all versions from 7.0.x to 7.2.x.
+## 1.0.1
+  * Removed the old java code that was unused.
+## 1.0.0
+  * Lots and lots of function documentation.
+  * Moved the optional parameters in to the function definitions instead of in the body of the function.
+## 0.4.0
+  * Finished all of the classes; the library now has the same functionality as the TA-Lib code it is ported from.
+## 0.3.0
+  * Set up the basic scaffolding of the library.