Go 1.15 update

Signed-off-by: Ben Hale <[email protected]>

go.mod

@@ -1,6 +1,6 @@
 module github.com/paketo-buildpacks/dist-zip
 
-go 1.14
+go 1.15
 
 require (
 	github.com/buildpacks/libcnb v1.16.0

go.sum

@@ -2,7 +2,6 @@ github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/Masterminds/semver/v3 v3.1.0 h1:Y2lUDsFKVRSYGojLJ1yLxSXdMmMYTYls0rCvoqmMUQk=
 github.com/Masterminds/semver/v3 v3.1.0/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
-github.com/buildpacks/libcnb v1.15.2 h1:f1b2LGqc0PXBSMHJyGFDepDn13YtiiXx2/JewQp9HWw=
 github.com/buildpacks/libcnb v1.15.2/go.mod h1:WTlY7cneYfP2+SNY/Bqywnx/+gMSbJkiZSjxZ34zoaU=
 github.com/buildpacks/libcnb v1.16.0 h1:KxRf6OcMjETvf0D8LBk4Q8mIPomFm0Snt+xdNqC7CtA=
 github.com/buildpacks/libcnb v1.16.0/go.mod h1:WTlY7cneYfP2+SNY/Bqywnx/+gMSbJkiZSjxZ34zoaU=
@@ -83,6 +82,7 @@ golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae h1:Ih9Yo4hSPImZOpfGuA4bR/ORKTAbhZo2AbWNRCnevdo=
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200817155316-9781c653f443 h1:X18bCaipMcoJGm27Nv7zr4XYPKGUy92GtqboKC2Hxaw=
 golang.org/x/sys v0.0.0-20200817155316-9781c653f443/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=