v1.8.0 to fix bug and optimize code

### Releases v1.8.0

1. Fix long timeout if using bad `IPAddress`
2. Optimize code
3. Display only successful responseText in examples
4. Improve debug messages by adding functions to display error messages instead of `cryptic error number`

Author: khoih-prog

README.md

@@ -201,14 +201,14 @@ Have a look at the discussion in [Different behaviour using the src_cpp or src_h
 
 #### 1. File [AsyncHTTPRequest.ino](examples/AsyncHTTPRequest/AsyncHTTPRequest.ino)
 
-https://github.com/khoih-prog/AsyncHTTPRequest_Teensy41/blob/92e7b27f5520da53b616abc76a005595415214ca/examples/AsyncHTTPRequest/AsyncHTTPRequest.ino#L38-L165
+https://github.com/khoih-prog/AsyncHTTPRequest_Teensy41/blob/d2cc3d7856e67370691e025e3a2acd8b90263d41/examples/AsyncHTTPRequest/AsyncHTTPRequest.ino#L38-L173
 
 
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 #### 2. File [defines.h](examples/AsyncHTTPRequest/defines.h)
 
-https://github.com/khoih-prog/AsyncHTTPRequest_Teensy41/blob/92e7b27f5520da53b616abc76a005595415214ca/examples/AsyncHTTPRequest/defines.h#L16-L50
+https://github.com/khoih-prog/AsyncHTTPRequest_Teensy41/blob/d2cc3d7856e67370691e025e3a2acd8b90263d41/examples/AsyncHTTPRequest/defines.h#L16-L50
 
 
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