tools/install.sh: updated to support Linux Mint 19.1 (tessa) (#588)

Author: juanrubio

tools/install.sh

@@ -59,9 +59,9 @@ elif echo "$RELIDS" | grep -E 'xenial|loki|sarah|serena|sonya|sylvia'; then
   # NOTE: Elementary OS 'loki' is based on xenial
   # NOTE: Linux Mint 'sarah', 'serena', 'sonya' and 'sylvia' are based on xenial
   DISTRO="ubuntu" ; RELEASE="xenial"
-elif echo "$RELIDS" | grep -E 'bionic|juno|tara'; then
+elif echo "$RELIDS" | grep -E 'bionic|juno|tara|tessa'; then
   # NOTE: Elementary OS 'juno' is based on bionic
-  # NOTE: Linux Mint 'tara' is based on bionic
+  # NOTE: Linux Mint 'tara' and 'tessa' are based on bionic
   DISTRO="ubuntu" ; RELEASE="bionic"
 else
   echo "Can't find a supported Debian or Ubuntu-based distribution."