Fix bug where reverse SVG wasn't generated.

[itamarst]

Fixes #150

[github-actions]

Benchmark results

diff --git a/benchmarks/results/lots-of-peaks.json b/benchmarks/results/lots-of-peaks.json
index 9230012..664bb6e 100644
--- a/benchmarks/results/lots-of-peaks.json
+++ b/benchmarks/results/lots-of-peaks.json
@@ -1,12 +1,12 @@
{
    "D1mr": [-3665605,-]{+3679314,+}
    "D1mw": [-2723841,-]{+2740376,+}
    "DLmr": [-1439693,-]{+1434478,+}
    "DLmw": [-1753964,-]{+1755299,+}
    "Dr": [-221171589,-]{+217888555,+}
    "Dw": [-90534144,-]{+88415134,+}
    "I1mr": [-3979900,-]{+3490452,+}
    "ILmr": [-14247,-]{+15376,+}
    "Ir": [-855002519,-]{+841641144,+}
    "Overall": [-1304422756-]{+1283739991+}
}
diff --git a/benchmarks/results/multithreading-1.json b/benchmarks/results/multithreading-1.json
index d7350fa..1d17d28 100644
--- a/benchmarks/results/multithreading-1.json
+++ b/benchmarks/results/multithreading-1.json
@@ -1,12 +1,12 @@
{
    "D1mr": [-1890512,-]{+1874923,+}
    "D1mw": [-411404,-]{+415140,+}
    "DLmr": [-68277,-]{+64469,+}
    "DLmw": [-85971,-]{+87528,+}
    "Dr": [-77312316,-]{+72292067,+}
    "Dw": [-32347615,-]{+29415500,+}
    "I1mr": [-1642608,-]{+1649902,+}
    "ILmr": [-8418,-]{+9064,+}
    "Ir": [-264077600,-]{+245400594,+}
    "Overall": [-394395607-]{+367699851+}
}
diff --git a/benchmarks/results/pystone.json b/benchmarks/results/pystone.json
index c09a04e..8007219 100644
--- a/benchmarks/results/pystone.json
+++ b/benchmarks/results/pystone.json
@@ -1,12 +1,12 @@
{
    "D1mr": [-2035945,-]{+5143779,+}
    "D1mw": [-817906,-]{+871554,+}
    "DLmr": [-32069,-]{+29369,+}
    "DLmw": [-61536,-]{+63388,+}
    "Dr": [-354442923,-]{+349096078,+}
    "Dw": [-145400642,-]{+142436546,+}
    "I1mr": [-10056133,-]{+9179942,+}
    "ILmr": [-8203,-]{+8914,+}
    "Ir": [-1135020106,-]{+1115693057,+}
    "Overall": [-1689557847-]{+1671056911+}
}
diff --git a/benchmarks/results/version.txt b/benchmarks/results/version.txt
index 92ec429..0fdc9dd 100644
--- a/benchmarks/results/version.txt
+++ b/benchmarks/results/version.txt
@@ -1 +1 @@
[-0.17.1.dev8+g76bf95d.d20210318-]{+2021.4.1.dev2+g80cad79.d20210408+}