bring back travis, patch ESP8266 BSP 2.5.1 error, enforce SSL fingerprint on ESP8266

Author: brentru

.travis.yml

@@ -20,7 +20,7 @@ install:
 
 script:
     # build ESP8266 target
-    # - build_platform esp8266
+    - build_platform esp8266
     # build SAMD target
     - arduino --install-library "WiFi101", "Ethernet"
     - build_platform zero

library.properties

@@ -1,5 +1,5 @@
 name=Adafruit IO Arduino
-version=3.1.0
+version=3.2.0
 author=Adafruit
 maintainer=Adafruit <[email protected]>
 sentence=Arduino library to access Adafruit IO.

src/AdafruitIO_Definitions.h

@@ -13,7 +13,7 @@
 #define ADAFRUITIO_DEFINITIONS_H_
 
 #define ADAFRUITIO_VERSION_MAJOR 3
-#define ADAFRUITIO_VERSION_MINOR 1
+#define ADAFRUITIO_VERSION_MINOR 2
 #define ADAFRUITIO_VERSION_PATCH 0
 
 // forward declaration

src/wifi/AdafruitIO_ESP8266.cpp

@@ -18,6 +18,7 @@ AdafruitIO_ESP8266::AdafruitIO_ESP8266(const char *user, const char *key, const
   _ssid = ssid;
   _pass = pass;
   _client = new WiFiClientSecure;
+  _client->setFingerprint(AIO_SSL_FINGERPRINT);
   _mqtt = new Adafruit_MQTT_Client(_client, _host, _mqtt_port);
   _http = new HttpClient(*_client, _host, _http_port);
 }