apply patches for PR DaveChild#55 and DaveChild#56

Author: dgradcliffe

.gitignore

@@ -0,0 +1,2 @@
+vendor/
+.phpunit.result.cache

composer.json

@@ -12,10 +12,11 @@
     ],
     "license": "BSD-2-Clause",
     "require": {
-        "php": ">=7.2.0"
+        "php": ">=7.2.0",
+        "ext-mbstring": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7"
+        "phpunit/phpunit": "^9"
     },
     "autoload": {
         "psr-0" : {
@@ -28,7 +29,6 @@
         }
     },
     "suggest": {
-        "ext-bcmath": "More accurate floating point calculations.",
-        "ext-mbstring": "Handle multi-byte text properly."
+        "ext-bcmath": "More accurate floating point calculations."
     }
 }