[exercise-basic]

changed captions Task 2, Task 3 and Task 4 to appear bold in the readme

exercises/exercise-basic/README.md

@@ -25,7 +25,7 @@ Locate all the files you will need for this exercise
 * The shared __spatial parameters file__: `injection2pspatialparams.hh`
 * The shared __input file__: `exercise_basic.input`
 
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 ### Task 2: Compiling and running an executable
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@@ -54,7 +54,7 @@ make exercise_basic_2p exercise_basic_2p2c
 paraview injection-2p2c.pvd
 ```
 
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 ### Task 3: Setting up a new executable (for a non-isothermal simulation)
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@@ -77,7 +77,7 @@ make # should rerun cmake
 make exercise_basic_2pni # builds new executable
 ```
 
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 ### Task 4: Setting up a non-isothermal __2pni__ test problem
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