air_quality code formatting

Author: Panosfunk

packages/air_quality/lib/air_quality.dart

@@ -31,20 +31,21 @@ enum AirQualityLevel {
 }
 
 AirQualityLevel airQualityIndexToLevel(int index) {
-  if (index < 0)
+  if (index < 0) {
     return AirQualityLevel.UNKNOWN;
-  else if (index <= 50)
+  } else if (index <= 50) {
     return AirQualityLevel.GOOD;
-  else if (index <= 100)
+  } else if (index <= 100) {
     return AirQualityLevel.MODERATE;
-  else if (index <= 150)
+  } else if (index <= 150) {
     return AirQualityLevel.UNHEALTHY_FOR_SENSITIVE_GROUPS;
-  else if (index <= 200)
+  } else if (index <= 200) {
     return AirQualityLevel.UNHEALTHY;
-  else if (index <= 300)
+  } else if (index <= 300) {
     return AirQualityLevel.VERY_UNHEALTHY;
-  else
+  } else {
     return AirQualityLevel.HAZARDOUS;
+  }
 }
 
 /// A class for storing Air Quality JSON Data fetched from the API.