Fixing inversion // Upd Readme and FDSN data download

FDSN-data-download.ipynb

@@ -11,7 +11,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This examples shows how to download restricted waveform data from the geofon database."
+    "This examples shows how to download restricted waveform data from the Geofon database using a cryptograpghic token.  \n",
+    "A personal file `token.asc` is required for this example."
    ]
   },
   {
@@ -62,7 +63,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.2"
+   "version": "3.7.3rc1"
   }
  },
  "nbformat": 4,

README.md

@@ -5,3 +5,8 @@ Hands-on examples from the Pyrocko universe orbiting Jupyter.
 ## Double-Couple Waveform Inversion
 
 A straight-forward inversion for a double couple source model using scipy's optimization strategies is excersized in `Double-Couble-Waveform-Inversion.ipynb`.
+
+
+## FDSN Data Download
+
+Download private waveform data through an FDSN server using a cryotographic certificate.