Merge pull request #345 from keyboardio/h/use-error-when-v2-only

Give a nice error message on Kaleidoscope.use() when compiling with V2 API only

src/Kaleidoscope.h

@@ -140,6 +140,11 @@ class Kaleidoscope_ {
     use(plugins...);
 #pragma GCC diagnostic pop
   }
+#else
+  // NOTE: Do **NOT** remove this when sunsetting the V1 API!
+  inline void use(...) {
+    static_assert(false, _DEPRECATE(_DEPRECATED_MESSAGE_USE));
+  }
 #endif
 
   // ---- hooks ----