Update CMakeLists.txt

Missing upper-case character letter in PLUGIN_CODE for GarageBand compatibility.

src/Part1_GettingStarted/002_minimal_plugin_cmake/CMakeLists.txt

@@ -50,7 +50,7 @@ juce_add_plugin(minimal_plugin
     # EDITOR_WANTS_KEYBOARD_FOCUS TRUE/FALSE    # Does the editor need keyboard focus?
     COPY_PLUGIN_AFTER_BUILD TRUE        # Should the plugin be installed to a default location after building?
     PLUGIN_MANUFACTURER_CODE Yeek               # A four-character manufacturer id with at least one upper-case character
-    PLUGIN_CODE abc1                            # A unique four-character plugin id with exactly one upper-case character
+    PLUGIN_CODE Abc1                            # A unique four-character plugin id with exactly one upper-case character
                                                 # GarageBand 10.3 requires the first letter to be upper-case, and the remaining letters to be lower-case
     FORMATS AU VST3 Standalone                  # The formats to build. Other valid formats are: AAX Unity VST AU AUv3
     PRODUCT_NAME "minimal_plugin")        # The name of the final executable, which can differ from the target name