add DMA support for nrf52

.travis.yml

@@ -1,6 +1,5 @@
 language: c
 sudo: false
-dist: "trusty"
 cache:
   directories:
     - ~/arduino_ide
@@ -12,6 +11,13 @@ env:
   global:
      - PRETTYNAME="Adafruit GFX Library"
 
+addons:
+  apt:
+    packages:
+      - python3
+      - python3-pip
+      - python3-setuptools
+
 before_install:
    - source <(curl -SLs https://raw.githubusercontent.com/adafruit/travis-ci-arduino/master/install.sh)
 

library.properties

@@ -1,5 +1,5 @@
 name=Adafruit GFX Library
-version=1.5.7
+version=1.6.0
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=Adafruit GFX graphics core library, this is the 'core' class that all our other graphics libraries derive from.