Switch docs to HTTPS

platformio/exception.py

@@ -241,7 +241,7 @@ class UpgradeError(PlatformioException):
 
 * Upgrade using `pip install -U platformio`
 * Try different installation/upgrading steps:
-  http://docs.platformio.org/page/installation.html
+  https://docs.platformio.org/page/installation.html
 """
 
 
@@ -265,7 +265,7 @@ class DebugSupportError(PlatformioException):
 
     MESSAGE = ("Currently, PlatformIO does not support debugging for `{0}`.\n"
                "Please contact support@pioplus.com or visit "
-               "< http://docs.platformio.org/page/plus/debugging.html >")
+               "< https://docs.platformio.org/page/plus/debugging.html >")
 
 
 class DebugInvalidOptions(PlatformioException):