Update Alpine linux installation document (#373)

Author: paulzakin

README.md

@@ -82,7 +82,7 @@ port install libxml2 xmlsec pkgconfig
 ### Alpine
 
 ``` bash
-apk add build-base libressl libffi-dev libressl-dev libxslt-dev libxml2-dev xmlsec-dev xmlsec
+apk add build-base openssl libffi-dev openssl-dev libxslt-dev libxml2-dev xmlsec-dev xmlsec
 ```
 
 ## Troubleshooting

doc/source/install.rst

@@ -59,7 +59,7 @@ Alpine
 
 .. code-block:: bash
 
-   apk add build-base libressl libffi-dev libressl-dev libxslt-dev libxml2-dev xmlsec-dev xmlsec
+   apk add build-base openssl libffi-dev openssl-dev libxslt-dev libxml2-dev xmlsec-dev xmlsec
 
 
 Troubleshooting