fix edc91ea md rst issue

README.rst

@@ -31,7 +31,11 @@ Installation
 
 graphtools is available on `pip`. Install by running the following in a terminal::
 
-        pip install --user graphtools
+    pip install --user graphtools
+
+Alternatively, graphtools can be installed using `Conda <https://conda.io/docs/>`_ (most easily obtained via the `Miniconda Python distribution <https://conda.io/miniconda.html>`_)::
+
+    conda install -c conda-forge graphtools
 
 Usage example
 -------------
@@ -40,14 +44,14 @@ The `graphtools.Graph` class provides an all-in-one interface for k-nearest neig
 
 Use it as follows::
 
-        from sklearn import datasets
-        import graphtools
-        digits = datasets.load_digits()
-        G = graphtools.Graph(digits['data'])
-        K = G.kernel
-        P = G.diff_op
-        G = graphtools.Graph(digits['data'], n_landmark=300)
-        L = G.landmark_op
+    from sklearn import datasets
+    import graphtools
+    digits = datasets.load_digits()
+    G = graphtools.Graph(digits['data'])
+    K = G.kernel
+    P = G.diff_op
+    G = graphtools.Graph(digits['data'], n_landmark=300)
+    L = G.landmark_op
 
 Help
 ----