doc: added the first version number of this library adding the new ngx.ssl lua API functions.

Author: agentzh

lib/ngx/ssl.md

@@ -329,6 +329,8 @@ to cache the cdata result.
 
 This function can be called in whatever contexts.
 
+This function was first added in version `0.1.7`.
+
 [Back to TOC](#table-of-contents)
 
 parse_pem_priv_key
@@ -345,6 +347,8 @@ In case of failures, returns `nil` and a string describing the error.
 
 This function can be called in whatever contexts.
 
+This function was first added in version `0.1.7`.
+
 [Back to TOC](#table-of-contents)
 
 set_cert
@@ -358,6 +362,8 @@ Sets the SSL certificate chain opaque pointer returned by the
 
 Returns `true` on success, or a `nil` value and a string describing the error otherwise.
 
+This function was first added in version `0.1.7`.
+
 [Back to TOC](#table-of-contents)
 
 set_priv_key
@@ -371,6 +377,8 @@ Sets the SSL private key opaque pointer returned by the
 
 Returns `true` on success, or a `nil` value and a string describing the error otherwise.
 
+This function was first added in version `0.1.7`.
+
 [Back to TOC](#table-of-contents)
 
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