Remove old, unsupported Ubuntu versions and adds new ones.

https://releases.ubuntu.com/

Author: Zachinquarantine

scripts/install_deps.sh

@@ -267,32 +267,11 @@ case $(uname -s) in
                         echo "Installing solidity dependencies on Ubuntu Trusty Tahr (14.04)."
                         echo "Or, you may also be running Linux Mint Qiana / Rebecca / Rafaela / Rosa (base: Ubuntu Trusty Tahr (14.04).)"
                         ;;
-                    utopic)
-                        echo "Installing solidity dependencies on Ubuntu Utopic Unicorn (14.10)."
-                        ;;
-                    vivid)
-                        echo "Installing solidity dependencies on Ubuntu Vivid Vervet (15.04)."
-                        ;;
-                    wily)
-                        echo "Installing solidity dependencies on Ubuntu Wily Werewolf (15.10)."
-                        ;;
                     xenial|sarah|serena|sonya|sylvia)
                         echo "Installing solidity dependencies on Ubuntu Xenial Xerus (16.04)."
                         echo "Or, you may also be running Linux Mint Sarah / Serena / Sonya / Sylvia (base: Ubuntu Xenial Xerus (16.04).)"
                         install_z3="libz3-dev"
                         ;;
-                    yakkety)
-                        echo "Installing solidity dependencies on Ubuntu Yakkety Yak (16.10)."
-                        install_z3="libz3-dev"
-                        ;;
-                    zesty)
-                        echo "Installing solidity dependencies on Ubuntu Zesty (17.04)."
-                        install_z3="libz3-dev"
-                        ;;
-                    artful)
-                        echo "Installing solidity dependencies on Ubuntu Artful (17.10)."
-                        install_z3="libz3-dev"
-                        ;;
                     bionic)
                         echo "Installing solidity dependencies."
                         install_z3="libz3-dev"
@@ -301,6 +280,10 @@ case $(uname -s) in
                         echo "Installing solidity dependencies."
                         install_z3="libz3-dev"
                         ;;
+                    hirsute)
+                        echo "Installing solidity dependencies."
+                        install_z3="libz3-dev"
+                        ;;
                     betsy)
                         #do not try anything for betsy.
                         echo "Linux Mint Betsy is not supported at the moment as it runs off of Debian."
@@ -315,7 +298,7 @@ case $(uname -s) in
                         echo "ERROR - Unknown or unsupported Ubuntu version ($(lsb_release -cs))"
                         echo "ERROR - This might not work, but we are trying anyway."
                         echo "Please drop us a message at https://gitter.im/ethereum/solidity-dev."
-                        echo "We only support Trusty, Utopic, Vivid, Wily, Xenial, Yakkety, Zesty, Artful and Bionic."
+                        echo "We only support Trusty, Xenial, Bionic, Focal, and Hirsute."
                         install_z3="libz3-dev"
                         ;;
                 esac