Add dependency to module documentation

Signed-off-by: Jim Easterbrook <jim@jim-easterbrook.me.uk>

src/pywws/__init__.py

@@ -1,3 +1,3 @@
 __version__ = '18.8.0'
-_release = '1585'
-_commit = '32c86b8'
+_release = '1586'
+_commit = 'd2d51a1'

src/pywws/examples/modules/aws_api_gw_service.py

@@ -21,6 +21,7 @@
 This is for any service that accepts key value data via a GET method. This
 supports optional extra headers.
 
+* Additional dependency: http://docs.python-requests.org/
 * Example ``weather.ini`` configuration::
 
     [aws_api_gw_service]

src/pywws/service/metoffice.py

@@ -26,6 +26,7 @@
 
 * Create account: https://register.metoffice.gov.uk/WaveRegistrationClient/public/newaccount.do?service=weatherobservations
 * API: http://wow.metoffice.gov.uk/support/dataformats#automatic
+* Additional dependency: http://docs.python-requests.org/
 * Example ``weather.ini`` configuration::
 
     [metoffice]

src/pywws/service/openweathermap.py

@@ -23,6 +23,7 @@
 
 * Create account: https://home.openweathermap.org/users/sign_up
 * API: https://openweathermap.org/stations
+* Additional dependency: http://docs.python-requests.org/
 * Example ``weather.ini`` configuration::
 
     [openweathermap]

src/pywws/service/pwsweather.py

@@ -24,6 +24,7 @@
 
 * Create account: http://www.pwsweather.com/register.php
 * API based on WU protocol: `<http://wiki.wunderground.com/index.php/PWS_-_Upload_Protocol>`_
+* Additional dependency: http://docs.python-requests.org/
 * Example ``weather.ini`` configuration::
 
     [pwsweather]

src/pywws/service/temperaturnu.py

@@ -22,6 +22,7 @@
 in many places.
 
 * Web site: http://www.temperatur.nu/
+* Additional dependency: http://docs.python-requests.org/
 * Example ``weather.ini`` configuration::
 
     [temperaturnu]

src/pywws/service/underground.py

@@ -23,6 +23,7 @@
 
 * Create account: http://www.wunderground.com/members/signup.asp
 * API: `<http://wiki.wunderground.com/index.php/PWS_-_Upload_Protocol>`_
+* Additional dependency: http://docs.python-requests.org/
 * Example ``weather.ini`` configuration::
 
     [underground]

src/pywws/service/wetterarchivde.py

@@ -23,6 +23,7 @@
 reasons.
 
 * Register station: https://www.wetter.com/mein_wetter/login/
+* Additional dependency: http://docs.python-requests.org/
 * Example ``weather.ini`` configuration::
 
     [wetterarchivde]