simplify version check

Author: DomAmato

install.sh

@@ -61,8 +61,7 @@ function install_software() {
 }
 
 function check_python_version() {
-    python3 -V | grep '3.[7-9].[0-9]' &> /dev/null
-    if ! [ $? == 0 ]; then
+    if ! python3 -V | grep '3.[7-9].[0-9]' > /dev/null 2>&1; then
         echo "An unsupported version of python 3 is installed. Must have python 3.7+ installed to use the Hologram SDK"
         exit 1
     fi
@@ -125,8 +124,7 @@ do
             pause "Installing $program. Press [Enter] key to continue...";
             install_software 'python3-pip'
         fi
-        pip3 -V | grep '3.[7-9]' &> /dev/null
-        if ! [ $? == 0 ]; then
+        if ! pip3 -V | grep '3.[7-9]' >/dev/null 2>&1; then
             echo "pip3 is installed for an unsupported version of python."
             exit 1
         fi