v1.8.0 to reduce String usage

### Major Releases v1.8.0 1. Reduce usage of Arduino String with std::string 2. Optimize library code and examples by using **reference-passing instead of value-passing**. 3. Update `Packages' Patches`

Author: khoih-prog

changelog.md

@@ -43,7 +43,7 @@
 ### Major Releases v1.8.0
 
 1. Reduce usage of Arduino String with std::string
-2. Optimize library code and examples by using reference-passing instead of value-passing.
+2. Optimize library code and examples by using **reference-passing instead of value-passing**.
 3. Update `Packages' Patches`
 
 ### Releases v1.7.1

keywords.txt

@@ -12,6 +12,7 @@ HTTPUploadStatus KEYWORD1
 HTTPClientStatus KEYWORD1
 HTTPUpload KEYWORD1
 HTTPAuthMethod KEYWORD1
+EWString KEYWORD1
 
 #######################
 # EthernetHttpClient