update require

MikaelSlevinsky · MikaelSlevinsky · commit 42c647914f24 · 2017-05-15T15:22:58.000-05:00
diff --git a/REQUIRE b/REQUIRE
@@ -3,4 +3,4 @@ ToeplitzMatrices 0.2
 HierarchicalMatrices 0.0.1
 LowRankApprox 0.0.2
 ProgressMeter 0.3.4
-Compat 0.18
+Compat 0.17
