updated README

README.md

@@ -46,6 +46,10 @@ List of demos (not including [rstan and rstanarm demos](demos_rstan))
   - [demo10_3: Importance sampling with normal distribution as a proposal for Bioassay model](https://rawgit.com/avehtari/BDA_R_demos/master/demos_ch10/demo10_3.html)
 - Chapter 11
   - [demo11_1: Gibbs sampling illustration](https://rawgit.com/avehtari/BDA_R_demos/master/demos_ch11/demo11_1.html)
-  - [demo11_2_4: Metropolis sampling + PSRF illustration](https://rawgit.com/avehtari/BDA_R_demos/master/demos_ch11/demo11_2_4.html)
+  - [demo11_2: Metropolis sampling + convergence illustration](https://rawgit.com/avehtari/BDA_R_demos/master/demos_ch11/demo11_2.html)
+  - [demo11_3_4: Metropolis sampling + convergence illustration](https://rawgit.com/avehtari/BDA_R_demos/master/demos_ch11/demo11_3_4.html)
+- Chapter 12
+  - [demo12_1: Static Hamiltonian Monte Carlo illustration](https://rawgit.com/avehtari/BDA_R_demos/master/demos_ch12/demo12_1.html)
+
 
 (Using rawgit as github doesn't display html or Rmd correctly)