spdx-licenses-list: update to 3.18.

Also:
- update common/travis/license.lst.

common/travis/license.lst

@@ -80,6 +80,7 @@ CC-BY-2.5-AU
 CC-BY-2.5
 CC-BY-3.0-AT
 CC-BY-3.0-DE
+CC-BY-3.0-IGO
 CC-BY-3.0-NL
 CC-BY-3.0-US
 CC-BY-3.0
@@ -223,6 +224,8 @@ GPL-3.0-linking-source-exception
 GPL-3.0-only
 GPL-3.0-or-later
 GPL-CC-1.0
+GStreamer-exception-2005
+GStreamer-exception-2008
 Giftware
 Glide
 Glulxe
@@ -266,6 +269,8 @@ LPPL-1.1
 LPPL-1.2
 LPPL-1.3a
 LPPL-1.3c
+LZMA-SDK-9.11-to-9.20
+LZMA-SDK-9.22
 LZMA-exception
 Latex2e
 Leptonica
@@ -290,10 +295,12 @@ MPL-1.0
 MPL-1.1
 MPL-2.0-no-copyleft-exception
 MPL-2.0
+MS-LPL
 MS-PL
 MS-RL
 MTLL
 MakeIndex
+Minpack
 MirOS
 Motosoto
 MulanPSL-1.0
@@ -306,6 +313,7 @@ NBPL-1.0
 NCGL-UK-2.0
 NCSA
 NGPL
+NICTA-1.0
 NIST-PD-fallback
 NIST-PD
 NLOD-1.0
@@ -383,6 +391,7 @@ Plexus
 PolyForm-Noncommercial-1.0.0
 PolyForm-Small-Business-1.0.0
 PostgreSQL
+Python-2.0.1
 Python-2.0
 QPL-1.0
 Qhull
@@ -519,6 +528,7 @@ libpng-2.0
 libselinux-1.0
 libtiff
 mif-exception
+mpi-permissive
 mpich2
 mplus
 openvpn-openssl-exception