more reformatting

Former-commit-id: 26d572add85a5d3f656efce634c524232d905f49

README.md

@@ -100,15 +100,19 @@ We really heavily on Eigen. Nearly all inputs and outputs are Eigen matrices of
 some kind. However, we currently _only_ support Eigen's default column-major
 ordering. That means, we **do not** expect our code to work for matrices using
 the `Eigen::RowMajor` flag. If you can, change definitions like:
+
 ```cpp
 Eigen::Matrix<double, Eigen::Dynamic, 3, Eigen::RowMajor> A;
 ```
+
 to
+
 ```cpp
 Eigen::Matrix<double, Eigen::Dynamic, 3, Eigen::ColMajor> A;
 // or simply
 Eigen::Matrix<double, Eigen::Dynamic, 3> A;
 ```
+
 We hope to fix this, or at least identify which functions are safe (many of
 them probably work just fine). This requires setting up unit testing, which is
 a major _todo_ for our development.