Fix compile error on Clang.

src/analyzers/nyancatanalyzer.cpp

@@ -23,6 +23,7 @@
 #include <QTimerEvent>
 
 const char* NyanCatAnalyzer::kName = "Nyan nyan nyan";
+const float NyanCatAnalyzer::kPixelScale = 0.03f;
 
 
 NyanCatAnalyzer::NyanCatAnalyzer(QWidget* parent)

src/analyzers/nyancatanalyzer.h

@@ -45,7 +45,7 @@ private:
 
   static const int kHistorySize = 128;
   static const int kRainbowBands = 6;
-  static const float kPixelScale = 0.03;
+  static const float kPixelScale;
 
   static const int kFrameIntervalMs = 150;