Merge pull request #78 from algernon/h/Keyboardio/static-to-extern

Keyboardio: Change from static to extern

src/KeyboardioFirmware.cpp

@@ -53,3 +53,5 @@ Keyboardio_::use(KeyboardioPlugin *plugin, ...) {
     };
     va_end(ap);
 }
+
+Keyboardio_ Keyboardio;

src/KeyboardioFirmware.h

@@ -43,4 +43,4 @@ class Keyboardio_ {
     void use(KeyboardioPlugin *plugin, ...) __attribute__((sentinel));
 };
 
-static Keyboardio_ Keyboardio;
+extern Keyboardio_ Keyboardio;