README.md: clarify printpdf can't loading existing pdfs

After reading the README, I was still unsure whether printpdf could load existing pdfs, until I read fschutt#46. Here's a suggested clarification. Cheers !
AxelNilsson · Sep 7, 2020 · 5caa1f1 · 5caa1f1
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diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ printpdf = "0.3.2"
 
 ## Features
 
-Currently, printpdf can only write documents, not read them.
+Currently, printpdf can only create new documents and write them, it cannot load existing documents yet.
 
 - Page generation
 - Layers (Illustrator like layers)