Merge pull request luthfianto#3 from bahrunnur/patch-1

chore(README.md): Preinstallation: Add OSX

README.md

@@ -21,6 +21,25 @@ tldr: Install OpenSSL from [here](http://slproweb.com/products/Win32OpenSSL.html
 
 **Or alternatively, download my 64-bit `tldr.exe` instead from https://github.com/rilut/rust-tldr/releases, and include it to your PATH.**
 
+### OSX
+
+*Refer to the [OSX section of rust-openssl readme](https://github.com/sfackler/rust-openssl#osx)*
+
+tldr: If you are running El Capitan, you will encounter a problem from the missing openssl header when installing the client. To fix that, you should try all of this:
+
+```shell
+# first, try:
+brew link --force openssl
+
+# if it didn't work, try:
+export OPENSSL_INCLUDE_DIR=/usr/local/Cellar/openssl/1.0.2d_1/include/
+
+# if it still didn't work, try:
+export C_INCLUDE_PATH=/usr/local/Cellar/openssl/1.0.2d_1/include/
+```
+
+Read all of the possible fixes for the El Capitan problems at: https://github.com/sfackler/rust-openssl/issues/255
+
 ## Installation
 
 ```sh