Fix for missing 3

Author: henryiii

.travis.yml

@@ -157,7 +157,7 @@ matrix:
   # Test a PyPy 2.7 build
   - os: linux
     dist: trusty
-    env: PYPY=7.3 PYTHON=2.7 CPP=11 GCC=4.8
+    env: PYPY=7.3.1 PYTHON=2.7 CPP=11 GCC=4.8
     name: PyPy 7.3, Python 2.7, c++11, gcc 4.8
     addons:
       apt:
@@ -167,7 +167,7 @@ matrix:
           - gfortran
   - os: linux
     dist: xenial
-    env: PYPY=7.3 PYTHON=3.6 CPP=11 GCC=5
+    env: PYPY=7.3.1 PYTHON=3.6 CPP=11 GCC=5
     name: PyPy 7.3, Python 3.6, c++11, gcc 5
     addons:
       apt:
@@ -239,9 +239,9 @@ before_install:
     SCRIPT_RUN_PREFIX="docker exec --tty $containerid"
     $SCRIPT_RUN_PREFIX sh -c 'for s in 0 15; do sleep $s; apt-get update && apt-get -qy dist-upgrade && break; done'
   else
-    if [ "$PYPY" = "7.3" ]; then
-      curl -fSL https://bitbucket.org/pypy/pypy/downloads/pypy2.7-v7.3.1-linux64.tar.bz2 | tar xj
-      PY_CMD=$(echo `pwd`/pypy$PYTHON-v7.3.1-linux64/bin/pypy)
+    if [ -n "$PYPY" ]; then
+      curl -fSL https://bitbucket.org/pypy/pypy/downloads/pypy$PYTHON-v$PYPY-linux64.tar.bz2 | tar xj
+      PY_CMD=$(echo `pwd`/pypy$PYTHON-v$PYPY-linux64/bin/pypy$PY)
       CMAKE_EXTRA_ARGS+=" -DPYTHON_EXECUTABLE:FILEPATH=$PY_CMD"
     else
       PY_CMD=python$PYTHON