Disable M5stack on ESP32 by default

.arduino-ci.yaml

@@ -0,0 +1,21 @@
+compile:
+  libraries: ~
+  platforms:
+    - uno
+    - due
+    - zero
+    - leonardo
+    - mega2560
+    # - esp32
+    # - esp8266
+
+unittest:
+  libraries: ~
+  platforms:
+    - uno
+    - due
+    - zero
+    - leonardo
+    - mega2560
+    # - esp32
+    # - esp8266

.travis.yml

@@ -8,8 +8,6 @@ git:
 branches:
   except:
     - gh-pages
-before_install:
-  - sudo apt-get install -y doxygen graphviz
 script:
    - bundle install
    - bundle exec arduino_ci_remote.rb

src/user_options.h

@@ -15,8 +15,8 @@
 #define ENABLE_BUILT_IN_DRIVERS
 #define SM_MAX_BUSES 1
 
-// Uncomment to enable M5stack driver
-#define M5STACK_RS485
+// Uncomment to enable M5stack driver (requires M5stack library)
+// #define M5STACK_RS485
 #else
 #define SM_MAX_BUSES 10
 #endif