Update README.md

Author: thecodemonkey86

README.md

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+Typical symptom when trying to connect to MySQL / MariaDB using Qt but without the necessary plugin is the runtime error 
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+<pre><code>
+ QSqlDatabase: QMYSQL driver not loaded
+ QSqlDatabase: available drivers: QMYSQL
+</code></pre>
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 Since the Qt Company currently doesn't give a crap on providing qsqlmysql.dll in binary form, you have to build it on your own, which can be a pain. Here is a build for various Qt versions. Download precompiled qsqlmysql.dll from https://github.com/thecodemonkey86/qt_mysql_driver/releases
 
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