clearer env bool parse if

Author: johnb8

src/env.rs

@@ -127,12 +127,11 @@ impl Source for Environment {
 
             let value = if self.try_parsing {
                 let string_value = Value::new(Some(&uri), ValueKind::String(value.clone()));
+                let is_true_false =
+                    value.to_lowercase() == "true" || value.to_lowercase() == "false";
 
                 // if the value is "true" or "false" it should be parsed as a bool
-                if let (true, Ok(parsed)) = (
-                    value.to_lowercase() == "true" || value.to_lowercase() == "false",
-                    string_value.clone().into_bool(),
-                ) {
+                if let (true, Ok(parsed)) = (is_true_false, string_value.clone().into_bool()) {
                     ValueKind::Boolean(parsed)
                 } else if let Ok(parsed) = string_value.clone().into_int() {
                     ValueKind::Integer(parsed)