ob-plantupml: Added LaTeX output support

* lisp/ob-plantuml.el (org-babel-execute:plantuml): Added LaTeX output
 support.

TINYCHANGE

lisp/ob-plantuml.el

@@ -93,6 +93,8 @@ This function is called by `org-babel-execute-src-block'."
 			    " -teps" "")
 			(if (string= (file-name-extension out-file) "pdf")
 			    " -tpdf" "")
+			(if (string= (file-name-extension out-file) "tex")
+			    " -tlatex" "")
 			(if (string= (file-name-extension out-file) "vdx")
 			    " -tvdx" "")
 			(if (string= (file-name-extension out-file) "xmi")