git rid of most of the bare excepts

peru/cache.py

@@ -524,7 +524,7 @@ def delete_if_error(path):
     given path, and allow the exception to continue.'''
     try:
         yield
-    except:
+    except Exception:
         if os.path.exists(path):
             os.remove(path)
         raise

peru/edit_yaml.py

@@ -32,12 +32,12 @@ def _maybe_quote(val):
     try:
         int(val)
         needs_quoting = True
-    except:
+    except Exception:
         pass
     try:
         float(val)
         needs_quoting = True
-    except:
+    except Exception:
         pass
     if needs_quoting:
         return '"{}"'.format(val)

peru/runtime.py

@@ -176,7 +176,7 @@ def _get_parallel_fetch_limit(args):
         if parallel <= 0:
             raise PrintableError('Argument to --jobs must be 1 or more.')
         return parallel
-    except:
+    except Exception:
         raise PrintableError('Argument to --jobs must be a number.')