Fix unused/uninitialized variable warnings (#214)

src/Astronomy.cpp

@@ -111,7 +111,7 @@ Astronomy::MoonData Astronomy::calculateMoonData(uint16_t year, uint8_t month, u
   } else month -= 2;
 
   c = year / 100;
-  jd += 30.59 * month;
+  jd = 30.59 * month;
   jd += 365.25 * year;
   jd += day;
   jd += c / 4 - c;

src/MetOfficeClient.cpp

@@ -92,7 +92,6 @@ void MetOfficeClient::doUpdate(String url) {
     }
   }
 
-  int pos = 0;
   boolean isBody = false;
   char c;
 

src/ThingspeakClient.cpp

@@ -38,7 +38,6 @@ void ThingspeakClient::getLastChannelItem(String channelId, String readApiKey) {
     }
   }
 
-  int pos = 0;
   boolean isBody = false;
   char c;
 

src/WorldClockClient.cpp

@@ -87,7 +87,6 @@ void WorldClockClient::updateTime() {
     }
   }
 
-  int pos = 0;
   boolean isBody = false;
   char c;
   client.setNoDelay(false);