add newest gawk to ubuntu provisioning

circle.yml

@@ -3,6 +3,8 @@ dependencies:
     - if [[ ! -e tmux-2.2 ]]; then sudo bash ./test/provisioning/ubuntu.sh; fi
     - sudo mkdir -p /home/vagrant/ && sudo chmod a+w /home/vagrant && ln -s $(pwd) /home/vagrant/shared
     - tmux -V
+    - gawk -W version
+    - bash --version
 test:
   override:
     - ./test/run.sh within-vm

test/provisioning/ubuntu.sh

@@ -2,6 +2,7 @@
 
 apt-get remove -y tmux
 apt-get install -y libevent-dev libncurses5-dev expect fish
+apt-get install -y gawk
 
 useradd -m -p "$(perl -e "print crypt('fishman','sa');")" -s "/usr/bin/fish" fishman