Updated readme

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README.md

@@ -18,7 +18,7 @@ This is a python package that solves 1-Dimensional PDEs using hybridizable disco
 Notice that the oscillations near the shock are well controlled even without any artificial stablization mechanism.
 
 <p align="center">
-<a href="http://imgur.com/HrWIi4s"><img align="centre" img src="http://i.imgur.com/HrWIi4s.png" width="50%" height="50%" title="source: imgur.com" /></a>
+<img align="centre" img src="http://i.imgur.com/HrWIi4s.png" width="50%" height="50%" title="source: imgur.com" />
 </p>
 
 The main task of this project is to build an automated CFD framework based on HPDG discretization and robust adaptive mesh refinement. The solver is currently capable of solving 1D convection-diffusion equations and is being actively developed.