Fix QBE link in README
The current link is an unofficial and outdated fork.
@@ -292,7 +292,7 @@ ex100: func v, 0
## MIR project competitors
* I only see three projects which could be considered or adapted as real universal light-weight JIT competitors
- * [**QBE**](https://github.com/8l/qbe):
+ * [**QBE**](https://c9x.me/compile/):
* It is small (10K C lines)
* It uses SSA based IR (kind of simplified LLVM IR)
* It has the same optimizations as MIR-generator plus aliasing and loop analysis for better RA but QBE has no inlining
