Release of new version 5.0.0

Author: jfcherng

CHANGELOG_v5.md

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+
+## VERSION 5  AFTERNOON
+
+ * Version **5.0** - AFTERNOON
+   * 2019-02-22 02:24  **5.0.0**  initial release
+      * 9f85206 Update .rmt.yml
+      * 064a3b3 Add renderer option: outputTagAsString
+      * 23c59f8 Update jfcherng/php-sequence-matcher ^3.0
+      * 1eb6bbb Update example/old_file.txt and the new one.
+      * b9f2f7b Fix AbstractHtml::expandTabs() $tabSize undeclared
+      * 469abb7 Fix problem caused by in OP_EQ, it still may be $old !== $new
+      * 82ed9ca AbstractHtml::expandTabs() add argument: $onlyLeadingTabs
+      * dd6d8dc Code tidy
+      * 4750267 Move upgrading guide from readme to other files
+      * 12b6024 Separate CHANGELOG by major version
+      * ebbb509 Update readme
+      * ef735c9 Code tidy
+      * 4518927 Uniform more "from, to" into "old, new"
+      * 079a5ec Update readme
+      * dbcf0b8 Update readme
+      * b84bef5 Remove deprecated APIs
+      * 5330cd2 Uniform the term "base, changed" into "old, new"