Drop support for Go 1.7.

We can to use os.Executable in elves#519, which has been introduced in Go 1.8.
xiaq · Nov 29, 2017 · 46003d0 · 46003d0
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diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@ language: go
 env:
     - CGO_ENABLED=0
 go:
-    - 1.7
     - 1.8
     - 1.9
 sudo: false

diff --git a/README.md b/README.md
@@ -30,7 +30,7 @@ This README documents the development aspect of Elvish. Other information is to
 
 To build Elvish, you need
 
-*   A Go toolchain >= 1.7.
+*   A Go toolchain >= 1.8.
 
 *   Linux (with x86, x64 or amd64 CPU) or macOS (with reasonably new hardware).