Updated changelog for 10.6.0.

changelog.html

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 <div class="title" i18n="defaultChangelogHead"></div>
 
+<span>2019.09.15 - 10.6.0 - BetaFlight</span>
+<ul>
+    <li>Features:
+        <ul>
+            <li>added client-side autocomplete to CLI</li>
+	    <li>added voltage and amperage scale calibration based on meter readings</li>
+            <li>added dark mode</li>
+            <li>changed the OSD elements to be listed in alphabetical order</li>
+            <li>added 'Video Transmitter' tab to configure a VTX</li>
+            <li>added support for flashing Unified Targets with custom board configurations</li>
+            <li>added sliders for PID / filter tuning</li>
+        </ul>
+    </li>
+    <li>Fixes:
+        <ul>
+            <li>fixed the flashing progress bar</li>
+            <li>fixed the PID tab layout</li>
+            <li>various other UI fixes</li>
+        </ul>
+    </li>
+    <li>New GUI support for the following firmware features:
+        <ul>
+            <li>added visualisation of rate limit settings to the PID tuning graph</li>
+            <li>improved the arming disabled flags display</li>
+            <li>added iterm_relax cutoff</li>
+            <li>added debug modes</li>
+            <li>added custom gyro alignment</li>
+            <li>added Dshot telemetry information display to the motors tab</li>
+            <li>added RPM based filtering</li>
+            <li>new OSD display / statistics elements</li>
+        </ul>
+    </li>
+    <li>New Languages:
+        <ul>
+            <li>Galego (Galician)</li>
+            <li>Hrvatski (Croatian)</li>
+        </ul>
+    </li>
+</ul>
+
 <span>2019.04.13 - 10.5.1 - BetaFlight</span>
 <ul>
     <li>Fixes: