Fix links in README

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 # gram
 
-gram is an nMigen+LambdaSoC port of the [LiteDRAM]() core by [enjoy-digital](). It currently only targets ECP5+DDR3.
+gram is an nMigen+LambdaSoC port of the [LiteDRAM](https://github.com/enjoy-digital/litedram) core by [enjoy-digital](http://www.enjoy-digital.fr/). It currently only targets ECP5+DDR3.
+
+## Requirements
+
+nMigen + nMigen-SoC + LambdaSoC
+
+gram requires nMigen "master", as nMigen 0.2 has some nasty bugs that makes it emit buggy RTLIL.
 
 ## License