diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..3294f01
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,18 @@
+# http://editorconfig.org
+# For ATOM, install "editorconfig" and "linter-eslint" package
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.yml]
+indent_size = 2
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..85b81b6
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,16 @@
+* text=auto
+*.css linguist-vendored
+*.scss linguist-vendored
+*.js linguist-vendored
+*.svg binary
+CHANGELOG.md export-ignore
+package-lock.json -diff
+yarn.lock -diff
+composer.lock -diff
+
+# this library
+/bootstrap export-ignore
+/resources export-ignore
+/test export-ignore
+/bitbucket-pipelines.yml export-ignore
+/runtests export-ignore
diff --git a/.gitignore b/.gitignore
index aa5997f..73ac397 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,137 @@
+# this project
+
+# reyesoft projects
+.php_cs.cache
+
+
+# Created by https://www.gitignore.io/api/linux,laravel,netbeans,kdevelop4,phpstorm+all,phpcodesniffer,visualstudiocode,composer
+
+### Composer ###
 composer.phar
-vendor/
+/vendor/
 
 # Commit your application's lock file http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file
 # You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
-# composer.lock
\ No newline at end of file
+composer.lock
+
+### KDevelop4 ###
+*.kdev4
+.kdev4/
+
+### Laravel ###
+vendor/
+node_modules/
+npm-debug.log
+
+# Laravel 4 specific
+bootstrap/compiled.php
+app/storage/
+
+# Laravel 5 & Lumen specific
+public/storage
+public/hot
+storage/*.key
+.env.*.php
+.env.php
+.env
+Homestead.yaml
+Homestead.json
+
+# Rocketeer PHP task runner and deployment package. https://github.com/rocketeers/rocketeer
+.rocketeer/
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/
+
+### PHPCodeSniffer ###
+# CodeSniffer
+
+/vendor/*
+/wpcs/*
+
+### PhpStorm+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+### PhpStorm+all Patch ###
+# Ignores the whole idea folder
+# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
+
+.idea/
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history
+
+# End of https://www.gitignore.io/api/linux,laravel,netbeans,kdevelop4,phpstorm+all,phpcodesniffer,visualstudiocode,composer
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..b304549
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,15 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.3.0] - 2020-06-01
+
+### Added
+- Changelog
+
+### Changed
+- .gitignore
+
+## [0.2.1] - 2014-08-20
diff --git a/composer.json b/composer.json
index ebbfb62..e433a2a 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,11 @@
     }
   ],
   "require": {
-    "php": ">=5.3.0"
+    "php": ">=5.3.0",
+    "ext-bcmath": "*"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^9.0.0"
   },
   "autoload": {
     "psr-4": {