Update README.md

@@ -21,7 +21,8 @@ git clone ssh://git@khuhub.khu.ac.kr:12959/2017103956/howsTheAir.git
 4. Enter your API key in `secrets.json`
 {
   "openAPIKey": "",
-  "googleAPIKey": ""
+  "googleAPIKey": "",
+  "weatherAPIKey": ""
 }
 
 ## Method of Execution
@@ -37,6 +38,7 @@ npm start
 - [kakao map api](https://apis.map.kakao.com/)
 - [google map api](https://cloud.google.com/maps-platform/?utm_source=google&utm_medium=cpc&utm_campaign=FY18-Q2-global-demandgen-paidsearchonnetworkhouseads-cs-maps_contactsal_saf&utm_content=text-ad-none-none-DEV_c-CRE_396485513010-ADGP_Hybrid+%7C+AW+SEM+%7C+SKWS+~+Maps+%7C+BMM+%7C+Mapping+APIs-KWID_43700049560642328-kwd-412104684431-userloc_1009871&utm_term=KW_%2Bmap%20%2Bapis-ST_%2Bmap+%2Bapis&gclid=EAIaIQobChMIhtfai66Q6gIVRJ_CCh3Qqw_BEAAYASAAEgKLd_D_BwE)
 - [대기오염정보](https://www.data.go.kr/tcs/dss/selectApiDataDetailView.do?publicDataPk=15000581)
+- [대기 날씨 정보](https://rapidapi.com/blog/lp/openweathermap/?utm_source=google&utm_medium=cpc&utm_campaign=Alpha_104783631314&utm_term=openweathermap_e&gclid=EAIaIQobChMI_Ky1wqeX6gIViLaWCh1uCQSGEAAYASAAEgLfN_D_BwE)
 
 
 ## Contact