Updated readme.md

Updated readme.md because currenly the DallasTemperature and Onewire are under `lib_deps`.

Author: brammittendorff

usermods/Temperature/readme.md

@@ -39,7 +39,7 @@ default_envs = d1_mini
 ...
 [common]
 ...
-lib_deps_external =
+lib_deps =
   ...
   #For use SSD1306 OLED display uncomment following
   U8g2@~2.27.3
@@ -55,4 +55,4 @@ lib_deps_external =
 * Changed to use async, non-blocking implementation
 * Do not report low temperatures that indicate an error to mqtt
 * Disable plugin if temperature sensor not detected
-* Report the number of seconds until the first read in the info screen instead of sensor error
+* Report the number of seconds until the first read in the info screen instead of sensor error